I've been using the animation rigging package for quite a while but I've never struggled with this issue. When I use the two bone constraint, the arm will weirdly twist. I've tried many things like redoing the rig on the model, making it humanoid instead of generic. But none of them work. I tried using a free IK asset to see if it was an issue with my animation or rig, but it actually worked fine. So, why does this happen when using the animation rigging package?
Here's a gif that shows the issue and another that shows me moving the pose IK around