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EPIC Mannequin IK/FK Blend arms issue

Hello everyone,
I’m currently experiencing something very strange that I can’t quite explain.
When switching from IK to FK, the arm snaps to a sort of “A pose” kind of position, even though all controls are set to 0.
It happens with both arms for the time being

When deleting the rig and rebuilding everything, this issue seems to be gone? But I’d rather understand the problem and not re-do work, in case it reappears in the future. The joints themselves seem to be getting the transformations?
Thanks in advance

My bad. I set up FK Rest as T pose. That explained everything. Sorry again