Animation crashing Engine (Auto Retarget)

Unreal 5.4.1

I can create the retargetting assets just fine using the new auto system. Then I create the animation asset using the auto retarget rig I just created, it creates a thumbnail and looks promising. However every time I open the animation asset the engine crashes.

I am having the same issue with both Mixamo and Character Creator Skeletons, which makes me think the problem is in the engine rather than the imported assets, with it being persistent with 2 different sources.

I have done a little research but couldn’t really find how to fix the issue.

Kind regards.