When transferring animation from one skeleton to another (within the engine, not from Blender or somewhere else), a size error occurred - the animation skeleton decreased by hundreds of times (to the size of a flea). When trying to transfer the animation to the same skeleton, the same problem occurs, but in the preview editor itself (before the transfer), everything looks within normal limits.
I discovered the problem when transferring a project from UE 5.3 to 5.5; there were no problems before that.
The transferred model itself has its center somewhere in the air, not on the условной ground (hypothetical ground).