When I use a target bone on a forearm and a spine, the forearm stops following the forearms target bone accordingly. Instead it creates a weird offset that I haven't been able to fix. I was able to recreate this situation multiple times with the basic rig I made in the video below.
I'm not really sure what I'm doing wrong here that creates this glitch. Any help is super appreciated.
After inspecting a bunch of rigs that came with Moho Pro I realized a lot of them used long target bone like the one in the screenshot below (I didn't know you could make those bones as well). When I used that instead of my point target bone, my rig worked flawlessly! I hope this can help someone incase they get the same problem I had.
That probably means that the "ignore inverse kenematics" that is set as default for pin bones was the issue.
If you disable that for pin bones, they may still work.