Invalid Region Number - Every Project, Every Time I Change Tracks

I'm having an issue where I'll start a project, and every single time, at a certain point in the project, I'll get an error message that says Invalid Region Number when I load a new track. After this, I get the same error message every time I select a new track, even if it's an old one I've already loaded.

I'm working from a template, so all my tracks are already there, I'm just activating them in the session by clicking on the track. I haven't noticed any pattern in which tracks/plugins might be causing the issue; like I said, it happens with every track on this computer only- I have a second computer which I use regularly, and use the same template, but I've never once gotten this error message on that computer.

I have tested this with tracks with 3rd party plugins loaded and Logic native plugins like Alchemy, and it happens either way.

I'm using a 2019 Mac Pro, running OS 12.6, LPX Version 10.7.6