diff --git a/.changelog/25789.txt b/.changelog/25789.txt
new file mode 100644
index 00000000000..fdf2e6098b2
--- /dev/null
+++ b/.changelog/25789.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+data-source/aws_networkmanager_core_network_policy_document: Fix bug where bool values in `segments` blocks weren't being included in json payloads
+```
diff --git a/internal/service/networkmanager/core_network_policy_document_data_source_test.go b/internal/service/networkmanager/core_network_policy_document_data_source_test.go
index 98ce77bf041..e2062f0e6b2 100644
--- a/internal/service/networkmanager/core_network_policy_document_data_source_test.go
+++ b/internal/service/networkmanager/core_network_policy_document_data_source_test.go
@@ -76,7 +76,7 @@ data "aws_networkmanager_core_network_policy_document" "test" {
   segments {
     name                          = "AnotherGoodSegmentSpecification"
     description                   = "A good segment."
-    require_attachment_acceptance = true
+    require_attachment_acceptance = false
     isolate_attachments           = false
     allow_filter                  = ["AllowThisSegment"]
   }
@@ -99,12 +99,12 @@ data "aws_networkmanager_core_network_policy_document" "test" {
   segments {
     name                          = "b"
     require_attachment_acceptance = true
-    isolate_attachments           = false
+    isolate_attachments           = true
   }
   segments {
     name                          = "c"
-    require_attachment_acceptance = true
     isolate_attachments           = false
+    require_attachment_acceptance = true
   }
 
   segment_actions {
@@ -249,7 +249,7 @@ data "aws_networkmanager_core_network_policy_document" "test" {
     action {
       association_method = "constant"
       segment            = "GoodSegmentSpecification"
-      require_acceptance = true
+      require_acceptance = false
     }
   }
 
@@ -314,6 +314,7 @@ func testAccPolicyDocumentExpectedJSON() string {
         "us-east-1",
         "eu-west-1"
       ],
+      "isolate-attachments": false,
       "require-attachment-acceptance": true
     },
     {
@@ -322,29 +323,35 @@ func testAccPolicyDocumentExpectedJSON() string {
       "allow-filter": [
         "AllowThisSegment"
       ],
-      "require-attachment-acceptance": true
+      "isolate-attachments": false,
+      "require-attachment-acceptance": false
     },
     {
       "name": "AllowThisSegment",
       "deny-filter": [
         "DenyThisSegment"
       ],
+      "isolate-attachments": false,
       "require-attachment-acceptance": true
     },
     {
       "name": "DenyThisSegment",
+      "isolate-attachments": false,
       "require-attachment-acceptance": true
     },
     {
       "name": "a",
+      "isolate-attachments": false,
       "require-attachment-acceptance": true
     },
     {
       "name": "b",
+      "isolate-attachments": true,
       "require-attachment-acceptance": true
     },
     {
       "name": "c",
+      "isolate-attachments": false,
       "require-attachment-acceptance": true
     }
   ],
@@ -353,7 +360,8 @@ func testAccPolicyDocumentExpectedJSON() string {
       "rule-number": 1,
       "action": {
         "association-method": "tag",
-        "tag-value-of-key": "segment"
+        "tag-value-of-key": "segment",
+        "require-acceptance": false
       },
       "conditions": [
         {
@@ -435,7 +443,7 @@ func testAccPolicyDocumentExpectedJSON() string {
       "action": {
         "association-method": "constant",
         "segment": "GoodSegmentSpecification",
-        "require-acceptance": true
+        "require-acceptance": false
       },
       "conditions": [
         {
diff --git a/internal/service/networkmanager/core_network_policy_model.go b/internal/service/networkmanager/core_network_policy_model.go
index 5695c47ed5a..dffa5494516 100644
--- a/internal/service/networkmanager/core_network_policy_model.go
+++ b/internal/service/networkmanager/core_network_policy_model.go
@@ -35,7 +35,7 @@ type CoreNetworkAttachmentPolicyAction struct {
 	AssociationMethod string `json:"association-method,omitempty"`
 	Segment           string `json:"segment,omitempty"`
 	TagValueOfKey     string `json:"tag-value-of-key,omitempty"`
-	RequireAcceptance bool   `json:"require-acceptance,omitempty"`
+	RequireAcceptance bool   `json:"require-acceptance"`
 }
 
 type CoreNetworkAttachmentPolicyCondition struct {
@@ -51,8 +51,8 @@ type CoreNetworkPolicySegment struct {
 	AllowFilter                 interface{} `json:"allow-filter,omitempty"`
 	DenyFilter                  interface{} `json:"deny-filter,omitempty"`
 	EdgeLocations               interface{} `json:"edge-locations,omitempty"`
-	IsolateAttachments          bool        `json:"isolate-attachments,omitempty"`
-	RequireAttachmentAcceptance bool        `json:"require-attachment-acceptance,omitempty"`
+	IsolateAttachments          bool        `json:"isolate-attachments"`
+	RequireAttachmentAcceptance bool        `json:"require-attachment-acceptance"`
 }
 
 type CoreNetworkPolicyCoreNetworkConfiguration struct {