When I tried to open the chest after finishing the puzzle it didn't work (I'm on step 7). So I thought I was missing the plates on wall. I didn't realize that that was 2 steps from where I am so I am soft locked unable to open the chest for the first time. I think that is the issue idk why the plates are loaded in if I can't use them yet. I've tried wiping, reloading from checkpoint, and starting from fresh and the plates stayed activated and I still can't grab the chest. I want to finish the quest so I hope this issue can be fixed.