UE4 to UE5 migration root motion BUG?

Hi there,

So recently i migrated my project from UE4 to UE5. My character is custom, custom skeleton and mesh. My animations are custom, exported for my skeleton from blender/autorig. In UE4 i have fully functional root motion. In UE5.1.1 root motion is working perfect when opening the animation and looping it. But if i put that animation on a map and simulate…it plays in place…what is happening? Can anyone explain?
Please don’t tell me to retarget my rig or animation, i have no connections to the UE mannequin or UE animations.

Edit: i just tried with UE5.0.3 and the same result. I also reimported my skeleton and couple of animations and the same.

Thanks,
Alex