Movable actors reset to (0, 0, 0) on load if its level has never been set visible

[rtorrisi]

Saving actors in a level that has never been set to visible, result in a reset of Transform to (0, 0, 0) when loading back and set the level visible.

Steps to reproduce the behavior:

1. Create a persistent level A
2. Create a sublevel B
3. Add a movable actor to be serialized in B
4. Stream in B but set it not visible.
5. Save
6. Load, stream B and set it visible.
7. Actor tranform is reset to 0,0,0

• Engine Version: 4.26.2
• Plugin Version: 1.4
• OS: Windows 10

Possible solution (already tested):

Replace this line

SaveExtension/Source/SaveExtension/Private/Serialization/MTTask_SerializeActors.cpp

Line 79 in 390033b

Record.Transform = Actor->GetTransform();

(this implementation doesn't work due to world (used in GetTransform) beeing not valid if the level has never been streamed in.)

with

Record.Transform = Actor->GetRootComponent()->GetRelativeTransform();