When I was inputting animation for the bones of metahuman, I found that the FBX bones had a deviation error from the original bone position, and the body shape of metahuman would automatically become thinner. I used the built-in animation output of metahuman and then imported it again, which caused the same problem. Therefore, I can confirm that it was an error caused by the FBX import format. I have reported this bug and it is now affecting the FBX import function of UE5.5. I hope to release a new version as soon as possible to remove this bug, because my project cannot wait any longer，
