Getting this error when trying to paint foliage UE5.1 .
Assertion failed: !IsValidChecked(ExistingActor) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\ActorPartition\ActorPartitionSubsystem.cpp] [Line: 280]
Settings:
World Partition
All foliage was assigned to a DataLayer (Editor)
Is Spatially Loaded enabled on all landscape instances
The scene also included Procedural Foliage Spawner
The Solution for me was to delete the DataLayer containging the foliage.
Also tried without success:
Make DataLayer visible
Make all Landscape instances visible
Disabled Is Spatially Loaded on all Landscape instances.
Removing all ProceduralFoliageSpawner
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