Component in BP can't be created if bCookBlueprintComponentTemplateData is true in 4.21

1. Create a project from ThirdPerson template of 4.21
2. Add a SkeletalmeshComponent to ThirdPersonCharacter BP and set a skeletal mesh to it.
3. Remove the ThirdPersonCharacter BP from level and save the map.
4. Enable bCookBlueprintComponentTemplateData in ProjectSettings
5. Set "Event Driven Loader Enable" false in ProjectSettings.
6. Cook project and launch it.

The new SkeletalmeshComponent failed to create.

There is no problem in 4.20.

I think the following change caused the issue.

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