It lines up perfectly with the truss rod so I would say it is definitely that. It's on the side with 3 holes, but I just took off the end of the screw with some tin snips and that did the trick! It's deep enough to get some grip but a few mm shy of the truss rod. Hopefully that won't cause too many issues down the road. Still one screw short though! :(
Edit: No other problems regarding the truss rod placement and screw holes, just the one