After some experimenting it seems like the Final IK Bridge component is no longer needed? After removing it from the player character, the glitching has gone and the Final IK component (which had been auto-disabled before now) is working as expected.
It looks like the Bridge component was sending either conflicting or outdated data to the Final IK component?
Anyway, for now it looks like our problem is solved which is a relief as this issue has been bugging us (pun intended!) for a while.
It looks like the Bridge component was sending either conflicting or outdated data to the Final IK component?
Anyway, for now it looks like our problem is solved which is a relief as this issue has been bugging us (pun intended!) for a while.