From a fresh download of 5.4. Can’t rename or copy CHT_PoseSearchDatabases_Dense from GameAnimationSample. Simplest repro is to try to rename it.
[2024.06.14-14.24.13:069][ 34]LogSavePackage: Warning: ChooserTable /Game/Characters/UEFN_Mannequin/Animations/MotionMatchingData/CHT_PoseSearchDatabases_Sparse_renamed.CHT_PoseSearchDatabases_Sparse_renamed (1 refs)
[2024.06.14-14.24.13:069][ 34]LogSavePackage: Warning: 0) ObjectProperty /Script/Chooser.NestedChooser:Chooser
[2024.06.14-14.24.13:069][ 34]Warning: Can’t save C:/Users/LocalUser/Documents/Unreal Projects/GameAnimationSample2/Content/Characters/UEFN_Mannequin/Animations/MotionMatchingData/CHT_PoseSearchDatabases_Sparse_renamed.uasset: Graph is linked to external private object ChooserTable /Game/Characters/UEFN_Mannequin/Animations/MotionMatchingData/CHT_PoseSearchDatabases_Sparse.InAir (Chooser)
[2024.06.14-14.24.14:495][ 34]LogSlate: Window ‘Message’ being destroyed
[2024.06.14-14.24.14:504][ 34]Message dialog closed, result: Continue, title: Message, text: The asset ‘/Game/Characters/UEFN_Mannequin/Animations/MotionMatchingData/CHT_PoseSearchDatabases_Sparse_renamed’ (CHT_PoseSearchDatabases_Sparse_renamed.uasset) failed to save.
Cancel: Stop saving all assets and return to the editor.
Retry: Attempt to save the asset again.
Continue: Skip saving this asset only.
[2024.06.14-14.24.17:791][ 34]LogSlate: Window ‘Packages Failed To Save’ being destroyed
[2024.06.14-14.24.17:800][ 34]Message dialog closed, result: Ok, title: Packages Failed To Save, text: The following assets failed to save correctly:
/Game/Characters/UEFN_Mannequin/Animations/MotionMatchingData/CHT_PoseSearchDatabases_Sparse_renamed
It looks like this bug happens only with nested choosers.