Cannot instantiate an InstancedStaticMesh component with ConstructionScript

Starting with Unreal Engine 5.4, the logic for adding ISM instances by adding ISM components in the Construction Script (like below) has failed. 

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This issue accidentally was introduced at CL28594968. From this change, UInstancedStaticMeshComponent::CreateSceneProxy() started to early-return with null in the above repro scenario, due to a new flag bInsInstanceDataApplyCompleted.

1. Download the repro project, ISMIssue54.zip, and unzip it.
2. Open the project.
3. Open ConstSrcTest from the content browser.
4. Click BP_ConstTest from Outliner.
5. Change Default > Static Mesh in the Details panel.
6. Confirm the displaying mesh disappers.

Expected Behavior: The mesh chosen at step 5 appears (technically as an ISM instance)

Workaround in this repro project: Turn off and on Default > Generate flag to run ConstructionScript again.

[UE-23848] Bug Status

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