My project suddenly associated itself with PPro Beta, which I don't use?

I came back to my current PPro project after only a couple of hours, and suddenly it wouldn't open.  If  tried to open it, I got the following dialogue box:

Thing is, I don't use Beta. It's not installed on my machine. I noted that the .prproj file for my project, and all the incremental files in the auto-save folder, just had the "blank document" icon, showing that they weren't associated with any installed app at the moment.

I right-clicked on the project and chose "Open with", and boom, for some unknown reason Premiere Pro Beta, which just to reiterate is not installed, was listed as the default app to open it with. I chose Premiere Pro and it opened normally.

Any reason why it would have done this?

This is on macOS 13.6.6, PPro 24.3.0.