diff --git a/test/types/lean.test.ts b/test/types/lean.test.ts
index 745999d3aa0..7886f2b8b7c 100644
--- a/test/types/lean.test.ts
+++ b/test/types/lean.test.ts
@@ -176,7 +176,7 @@ async function gh13345_2() {
   const PlaceModel = model('Place', placeSchema);
 
   const place = await PlaceModel.findOne().lean().orFail().exec();
-  expectAssignable<FlattenMaps<Place>>(place);
+  expectAssignable<Place>(place);
   expectType<Record<string, string>>(place.images[0].description);
 }
 
diff --git a/test/types/models.test.ts b/test/types/models.test.ts
index a53404c5c00..51e646e1f44 100644
--- a/test/types/models.test.ts
+++ b/test/types/models.test.ts
@@ -644,7 +644,7 @@ async function gh13705() {
   const schema = new Schema({ name: String });
   const TestModel = model('Test', schema);
 
-  type ExpectedLeanDoc = (mongoose.FlattenMaps<{ name?: string }> & { _id: mongoose.Types.ObjectId });
+  type ExpectedLeanDoc = ({ name?: string } & { _id: mongoose.Types.ObjectId });
 
   const findByIdRes = await TestModel.findById('0'.repeat(24), undefined, { lean: true });
   expectType<ExpectedLeanDoc | null>(findByIdRes);
diff --git a/test/types/schema.test.ts b/test/types/schema.test.ts
index 45dd2653c31..180e2de9a1a 100644
--- a/test/types/schema.test.ts
+++ b/test/types/schema.test.ts
@@ -15,7 +15,8 @@ import {
   SchemaType,
   Types,
   Query,
-  model
+  model,
+  InferHydratedDocumentType
 } from 'mongoose';
 import { expectType, expectError, expectAssignable } from 'tsd';
 import { ObtainDocumentPathType, ResolvePathType } from '../../types/inferschematype';
@@ -403,8 +404,8 @@ export function autoTypedSchema() {
     objectId2?: Types.ObjectId;
     objectId3?: Types.ObjectId;
     customSchema?: Int8;
-    map1?: Map<string, string>;
-    map2?: Map<string, number>;
+    map1?: Record<string, string>;
+    map2?: Record<string, number>;
     array1: string[];
     array2: any[];
     array3: any[];
@@ -1133,6 +1134,11 @@ function maps() {
   });
   const Test = model('Test', schema);
 
+  type Test1 = ObtainSchemaGeneric<typeof schema, 'DocType'>;
+  expectType<Record<string, number>>({} as Test1['myMap']);
+  type THydratedDocumentType = InferHydratedDocumentType<typeof schema>;
+  expectType<Map<string, number>>({} as THydratedDocumentType['myMap']);
+
   const doc = new Test({ myMap: { answer: 42 } });
   expectType<Map<string, number>>(doc.myMap);
   expectType<number | undefined>(doc.myMap!.get('answer'));
diff --git a/types/index.d.ts b/types/index.d.ts
index 95653baf5a4..2a53c0e1778 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -79,16 +79,16 @@ declare module 'mongoose' {
     collection?: string,
     options?: CompileModelOptions
   ): Model<
-  InferSchemaType<TSchema>,
-  ObtainSchemaGeneric<TSchema, 'TQueryHelpers'>,
-  ObtainSchemaGeneric<TSchema, 'TInstanceMethods'>,
-  ObtainSchemaGeneric<TSchema, 'TVirtuals'>,
-  HydratedDocument<
-  InferSchemaType<TSchema>,
-  ObtainSchemaGeneric<TSchema, 'TVirtuals'> & ObtainSchemaGeneric<TSchema, 'TInstanceMethods'>,
-  ObtainSchemaGeneric<TSchema, 'TQueryHelpers'>
-  >,
-  TSchema
+    InferSchemaType<TSchema>,
+    ObtainSchemaGeneric<TSchema, 'TQueryHelpers'>,
+    ObtainSchemaGeneric<TSchema, 'TInstanceMethods'>,
+    ObtainSchemaGeneric<TSchema, 'TVirtuals'>,
+    HydratedDocument<
+      InferSchemaType<TSchema>,
+      ObtainSchemaGeneric<TSchema, 'TVirtuals'> & ObtainSchemaGeneric<TSchema, 'TInstanceMethods'>,
+      ObtainSchemaGeneric<TSchema, 'TQueryHelpers'>
+    >,
+    TSchema
   > & ObtainSchemaGeneric<TSchema, 'TStaticMethods'>;
 
   export function model<T>(name: string, schema?: Schema<T, any, any> | Schema<T & Document, any, any>, collection?: string, options?: CompileModelOptions): Model<T>;
@@ -230,7 +230,11 @@ declare module 'mongoose' {
       ObtainDocumentType<any, EnforcedDocType, ResolveSchemaOptions<TSchemaOptions>>,
       ResolveSchemaOptions<TSchemaOptions>
     >,
-    THydratedDocumentType = HydratedDocument<DocType, TVirtuals & TInstanceMethods>
+    THydratedDocumentType = InferHydratedDocumentType<
+      DocType,
+      EnforcedDocType,
+      ResolveSchemaOptions<TSchemaOptions>
+    > //HydratedDocument<DocType, TVirtuals & TInstanceMethods>
   >
     extends events.EventEmitter {
     /**
@@ -658,7 +662,7 @@ declare module 'mongoose' {
   type FlattenProperty<T> = T extends Map<any, infer V>
     ? Record<string, V> : T extends TreatAsPrimitives
       ? T : T extends Types.DocumentArray<infer ItemType>
-        ? Types.DocumentArray<FlattenMaps<ItemType>> : FlattenMaps<T>;
+        ? Types.DocumentArray<ItemType> : T;
 
   export type actualPrimitives = string | boolean | number | bigint | symbol | null | undefined;
   export type TreatAsPrimitives = actualPrimitives | NativeDate | RegExp | symbol | Error | BigInt | Types.ObjectId | Buffer | Function;
diff --git a/types/inferschematype.d.ts b/types/inferschematype.d.ts
index 75240ed1675..30538ba2e90 100644
--- a/types/inferschematype.d.ts
+++ b/types/inferschematype.d.ts
@@ -24,13 +24,35 @@ declare module 'mongoose' {
    * @param {EnforcedDocType} EnforcedDocType A generic type enforced by user "provided before schema constructor".
    * @param {TypeKey} TypeKey A generic of literal string type."Refers to the property used for path type definition".
    */
-   type ObtainDocumentType<DocDefinition, EnforcedDocType = any, TSchemaOptions extends Record<any, any> = DefaultSchemaOptions> =
-   IsItRecordAndNotAny<EnforcedDocType> extends true ? EnforcedDocType : {
-     [K in keyof (RequiredPaths<DocDefinition, TSchemaOptions['typeKey']> &
-     OptionalPaths<DocDefinition, TSchemaOptions['typeKey']>)]: ObtainDocumentPathType<DocDefinition[K], TSchemaOptions['typeKey']>;
-   };
+  type ObtainDocumentType<
+    DocDefinition,
+    EnforcedDocType = any,
+    TSchemaOptions extends Record<any, any> = DefaultSchemaOptions,
+    UseHydratedType = false
+  > =
+  IsItRecordAndNotAny<EnforcedDocType> extends true ? EnforcedDocType : {
+    [
+    K in keyof (RequiredPaths<DocDefinition, TSchemaOptions['typeKey']> &
+    OptionalPaths<DocDefinition, TSchemaOptions['typeKey']>)
+    ]: ObtainDocumentPathType<
+      DocDefinition[K],
+      TSchemaOptions['typeKey'],
+      UseHydratedType
+    >;
+  };
 
-   /**
+  /**
+   * @summary Obtains document schema type from Schema instance.
+   * @param {Schema} TSchema `typeof` a schema instance.
+   * @example
+   * const userSchema = new Schema({userName:String});
+   * type UserType = InferSchemaType<typeof userSchema>;
+   * // result
+   * type UserType = {userName?: string}
+   */
+  export type InferSchemaType<TSchema> = IfAny<TSchema, any, ObtainSchemaGeneric<TSchema, 'DocType'>>;
+
+  /**
    * @summary Obtains document schema type from Schema instance.
    * @param {Schema} TSchema `typeof` a schema instance.
    * @example
@@ -39,7 +61,13 @@ declare module 'mongoose' {
    * // result
    * type UserType = {userName?: string}
    */
-   export type InferSchemaType<TSchema> = IfAny<TSchema, any, ObtainSchemaGeneric<TSchema, 'DocType'>>;
+  export type InferHydratedDocumentType<
+    DocDefinition,
+    EnforcedDocType = any,
+    TSchemaOptions extends Record<any, any> = DefaultSchemaOptions
+  > = HydratedDocument<
+    ObtainDocumentType<DocDefinition, EnforcedDocType, TSchemaOptions, true>
+  >;
 
   /**
    * @summary Obtains schema Generic type by using generic alias.
@@ -155,10 +183,15 @@ type OptionalPaths<T, TypeKey extends string = DefaultTypeKey> = {
  * @param {PathValueType} PathValueType Document definition path type.
  * @param {TypeKey} TypeKey A generic refers to document definition.
  */
-type ObtainDocumentPathType<PathValueType, TypeKey extends string = DefaultTypeKey> = ResolvePathType<
-PathValueType extends PathWithTypePropertyBaseType<TypeKey> ? PathValueType[TypeKey] : PathValueType,
-PathValueType extends PathWithTypePropertyBaseType<TypeKey> ? Omit<PathValueType, TypeKey> : {},
-TypeKey
+type ObtainDocumentPathType<
+  PathValueType,
+  TypeKey extends string = DefaultTypeKey,
+  UseHydratedType = false
+> = ResolvePathType<
+  PathValueType extends PathWithTypePropertyBaseType<TypeKey> ? PathValueType[TypeKey] : PathValueType,
+  PathValueType extends PathWithTypePropertyBaseType<TypeKey> ? Omit<PathValueType, TypeKey> : {},
+  TypeKey,
+  UseHydratedType
 >;
 
 /**
@@ -174,7 +207,12 @@ type PathEnumOrString<T extends SchemaTypeOptions<string>['enum']> = T extends R
  * @param {TypeKey} TypeKey A generic of literal string type."Refers to the property used for path type definition".
  * @returns Number, "Number" or "number" will be resolved to number type.
  */
-type ResolvePathType<PathValueType, Options extends SchemaTypeOptions<PathValueType> = {}, TypeKey extends string = DefaultSchemaOptions['typeKey']> =
+type ResolvePathType<
+  PathValueType,
+  Options extends SchemaTypeOptions<PathValueType> = {},
+  TypeKey extends string = DefaultSchemaOptions['typeKey'],
+  UseHydratedType = false
+> =
   PathValueType extends Schema ? InferSchemaType<PathValueType> :
     PathValueType extends (infer Item)[] ?
       IfEquals<Item, never, any[], Item extends Schema ?
@@ -219,8 +257,8 @@ type ResolvePathType<PathValueType, Options extends SchemaTypeOptions<PathValueT
                                           PathValueType extends 'bigint' | 'BigInt' | typeof Schema.Types.BigInt ? bigint :
                                             PathValueType extends 'uuid' | 'UUID' | typeof Schema.Types.UUID ? Buffer :
                                               IfEquals<PathValueType, Schema.Types.UUID> extends true ? Buffer :
-                                                PathValueType extends MapConstructor ? Map<string, ResolvePathType<Options['of']>> :
-                                                  IfEquals<PathValueType, typeof Schema.Types.Map> extends true ? Map<string, ResolvePathType<Options['of']>> :
+                                                PathValueType extends MapConstructor ? (UseHydratedType extends true ? Map<string, ResolvePathType<Options['of'], {}, DefaultSchemaOptions['typeKey'], UseHydratedType>> : Record<string, ResolvePathType<Options['of'], {}, DefaultSchemaOptions['typeKey'], UseHydratedType>>) :
+                                                  IfEquals<PathValueType, typeof Schema.Types.Map> extends true ? (UseHydratedType extends true ? Map<string, ResolvePathType<Options['of'], {}, DefaultSchemaOptions['typeKey'], UseHydratedType>> : Record<string, ResolvePathType<Options['of'], {}, DefaultSchemaOptions['typeKey'], UseHydratedType>>) :
                                                     PathValueType extends ArrayConstructor ? any[] :
                                                       PathValueType extends typeof Schema.Types.Mixed ? any:
                                                         IfEquals<PathValueType, ObjectConstructor> extends true ? any:
diff --git a/types/query.d.ts b/types/query.d.ts
index 3963481a20b..a7689506ead 100644
--- a/types/query.d.ts
+++ b/types/query.d.ts
@@ -180,7 +180,7 @@ declare module 'mongoose' {
   type QueryOpThatReturnsDocument = 'find' | 'findOne' | 'findOneAndUpdate' | 'findOneAndReplace' | 'findOneAndDelete';
 
   type GetLeanResultType<RawDocType, ResultType, QueryOp> = QueryOp extends QueryOpThatReturnsDocument
-    ? (ResultType extends any[] ? Require_id<FlattenMaps<RawDocType>>[] : Require_id<FlattenMaps<RawDocType>>)
+    ? (ResultType extends any[] ? Require_id<RawDocType>[] : Require_id<RawDocType>)
     : ResultType;
 
   class Query<ResultType, DocType, THelpers = {}, RawDocType = DocType, QueryOp = 'find'> implements SessionOperation {