If I understand the problem correctly, this is what it looks like when retargetting a bone that is rolled 360.0 and child -360.0 to compensate:

Very similar to this:

It’s just a guess, though.
If I understand the problem correctly, this is what it looks like when retargetting a bone that is rolled 360.0 and child -360.0 to compensate:

Very similar to this:

It’s just a guess, though.