Metahuman update 5.2 base skeleton problem

Hi Guys,

I have recently updated Metahumans in our project (game) and encountered serious problem with current animations made for customized metahuman skeletal meshes. You can see mentioned customized skeleton on the attached picture (left - original, right - customized).


After the update animated characters look grotesque (can’t show it though) - with elongated bones and unwanted additional rotations. It seems like my changes to the original skeleton were doubled - bones twice as long, additional rotation doubled.
I would be grateful for Your help.