Blueprinted Components lose transform in child actor BP

Hello,

I’ve encountered a bug whereby the transform of a component is lost in the following circumstances:

  1. Create a new Empty Blueprint project using 4.12.2
  2. Create a new Blueprint asset. Select Scene Component as the blueprint class. Name this blueprint “BPComp”
  3. Create a new Blueprint asset. Select Actor as the blueprint class. Name this blueprint “BPBaseActor”
  4. Edit the BPBaseActor blueprint. Add a new component of type “BPComp” to the class.
  5. Set the new component’s Location to be “0, 128, 0”
  6. In the content browser, select the blueprint “BPBaseActor” and right-click. Select “Create Child Blueprint Class”. The new blueprint will be named “BPBaseActor_Child”
  7. Edit the “BPBaseActor_Child” blueprint. Note that “BPComp (inherited)” appears in the Components list.
  8. Click on the “BPComp (inherited)” component. Note that the Location of the component is “0, 0, 0”
  9. Edit the Location of the component to be “0, 128, 0”.
  10. Click “compile”. Note that the Location of the component is once again “0, 0, 0”

Expected result: In steps 8 and 10, the Location of the component should be “0, 128, 0”.

Thanks,
Isaac
inbetweengames

Hello,

I have attempted to reproduce this issue, but have not been able to do so following the steps you provided. In my BPBaseActor_Child blueprint, the Inherited BPComp was correctly placed at 0,128,0.

Did you perform this repro in a clean project? Were there any small steps that may have been left out?

I’ve upgraded to 4.12.3 and the issue no longer occurs. I’m guessing it was related to this, which was marked fixed with 4.12.3:

Fixed! UE-31743 Components derived from scene component reset vector location upon closing and re-opening editor