Skeleton errors when re-importing skeleton mesh

I wish I had sample assets to share how to reproduce this issue, but I don’t just yet… Here is what is happening:

  • We have a bunch of models that are sharing the same skeleton
  • For one of these skeleton meshes, let’s call it SkelMesh Foo, it has a joint hierarchy not used in any of the other skeleton mesh models
  • We made big changes to the unique joint hierarchy in SkelMesh Foo
  • I re-imported SkelMesh Foo and received this error:

FAILED TO MERGE BONES:

This could happen if significant hierarchical change has been made - ie inserting bone between nodes

Would you like to regenerate Skeleton from this mesh?

WARNING: THIS WILL REQUIRE RECOMPRESS ALL ANIMATION DATA AND POTENTIALLY INVALIDATE

There are 5 options: Yes, No, Yes All, No All, Cancel

Result: If I pick “Yes All”, the skeleton reverts and only contains the bones from SkelMesh Foo

Expected Result: The skeleton would contain the bones from all the SkelMeshes that reference it

Note: At this point, if I go open a SkelMesh that was also bound to the Skeleton, I get this message:

The Skeleton Core_Skeleton, is missing bones that SkeletalMesh Bar needs. They will be added now. Please save the Skeleton!

If I click “OK”, the unique bones from SkelMesh Bar are merged into Core_Skeleton, but none of the animations against the skeleton work.

Hi, I have the same problem. Do you fix it?