I’ve been having this problem randomly since yesterday where the control rig shows up but no longer controls the metahuman skeleton. I thought that I some how broke the CR for this specific metahuman, so I made a new metahuman and when I brought it in the Sequencer, the same thing happen.
I’ve restarted UE 5.6, and my machine, but nothing changed.

Has anyone had this issue yet with a solution?
I figured out a temporary workaround, where I created a new project file and made a new metahuman with the metahuman creator in that project. After confirming that the rig worked, I migrated it to the broken rig project. So far, the rig seems to be working. But I would still love to know if there is a proper way to fix the rig in the initial file.
Oh ya, if I migrate the broken rig into the new project, any new metahuman I create in the new project also breaks like this. So I had to delete that project file and start over.