diff --git a/ibm/service/vpc/resource_ibm_is_instance.go b/ibm/service/vpc/resource_ibm_is_instance.go
index 1e1e0636d8..6a47492b0c 100644
--- a/ibm/service/vpc/resource_ibm_is_instance.go
+++ b/ibm/service/vpc/resource_ibm_is_instance.go
@@ -237,7 +237,7 @@ func ResourceIBMISInstance() *schema.Resource {
 										Optional:              true,
 										Computed:              true,
 										DiffSuppressOnRefresh: true,
-										DiffSuppressFunc:      flex.ApplyOnce,
+										DiffSuppressFunc:      flex.ApplyOnlyOnce,
 										Description:           "Indicates whether this cluster network interface will be automatically deleted when `target` is deleted.",
 									},
 									"name": &schema.Schema{
@@ -275,7 +275,7 @@ func ResourceIBMISInstance() *schema.Resource {
 													Type:             schema.TypeBool,
 													Optional:         true,
 													Computed:         true,
-													DiffSuppressFunc: flex.ApplyOnce,
+													DiffSuppressFunc: flex.ApplyOnlyOnce,
 													Description:      "Indicates whether this cluster network subnet reserved IP member will be automatically deleted when either `target` is deleted, or the cluster network subnet reserved IP is unbound.",
 												},
 												"name": &schema.Schema{
@@ -8351,10 +8351,22 @@ func compareInterfaces(old, new map[string]interface{}) bool {
 
 func buildCreateClusterNetworkAttachmentOptions(instanceID string, attachment map[string]interface{}) *vpcv1.CreateClusterNetworkAttachmentOptions {
 	networkInterface := attachment["cluster_network_interface"].([]interface{})[0].(map[string]interface{})
+
 	clusterNetworkInterface := &vpcv1.InstanceClusterNetworkAttachmentPrototypeClusterNetworkInterface{}
 
-	if autoDelete, ok := networkInterface["auto_delete"].(bool); ok {
-		clusterNetworkInterface.AutoDelete = &autoDelete
+	// if autoDelete, ok := networkInterface["auto_delete"].(bool); ok {
+	// 	clusterNetworkInterface.AutoDelete = &autoDelete
+	// }
+	if autoDelete, ok := networkInterface["auto_delete"]; ok {
+		// Convert interface{} to bool properly
+		autoDeletBool := false
+		switch v := autoDelete.(type) {
+		case bool:
+			autoDeletBool = v
+		case string:
+			autoDeletBool = v == "true"
+		}
+		clusterNetworkInterface.AutoDelete = &autoDeletBool
 	}
 
 	if name, ok := networkInterface["name"].(string); ok {