Bug report:

[seaxsun]

Describe the bug

Upon export, the character will hover with their feet not touching the ground
I use mocopi, VMC, and VMC4B for motion capture

To Reproduce

Set up my custom skeleton, export it, then import it using VRM, and finally capture motions using VMC4B.

Expected behavior

His feet are supposed to be on the ground, but there's always a floating issue. Characters imported from Vroid don't have this problem, so I think there might be an issue with VRM export.

Screenshots

Desktop (please complete the following information)

windows 11
blender 4.1
VRM format 2.20.37

Additional context