Same here. Crashes when trying to save a retarget. It crashes after (apparently) successfully creating a retarget result (but before an opportunity is given to save it) in the IKRetargeter when i press the save button. It crashes when using the Retarget Animation Assets Menu.
None of the options suggested above help.
My error is:
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 691] Array index out of bounds: 161 from an array of size 161
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