Can't open files using MuseScore 4 unless it's already running

Hi,

I have spent more than a few hours trying to figure this out and thought it was finally time to post.

I would greatly appreciate any help!

Context:
+ MacBook Pro; macOS Sonoma 14.6.1
+ MuseScore 4, version: 4.4.3.242971445
+ I have combed the forums as best I can (see troubleshooting section below).

The issue is that trying to open a .mscz or .mid file with:
+ Right click on the file > Open With > MuseScore 4.app (currently the default for those file types)
+ Double click on the file
+ Using terminal
+ Using ProcessBuilder (creates and executes terminal commands from Java code)

All results in the same behavior:
+ Splash screen appears; icon appears in dock; white dot under icon + bouncing
+ Shortly thereafter: icon disappears from dock, app is not launched

However, if MuseScore 4 is already running (because I started it manually), there is no issue. It is only when trying to open a file when MuseScore 4 is not currently running that it won't launch.

It works fine with MuseScore 3, GarageBand, etc. (programs that can open .mid files, I mean).

Troubleshooting undertaken thus far:
+ From rjchalkes: Uninstall, reboot, and reinstall (instructions https://musescore.org/en/node/366599)
+ From cbjeukendrup: deleting libMuseSamplerCoreLib.dylib (I don't have a usr/local/lib dir and cannot find the mentioned file anywhere; https://musescore.org/en/node/358850#comment-1222375)
+ Tried changing the default app for .mid/.mscz files from MuseScore 4 to something else, rebooting, changing it back

Nothing I have tried so far has worked.

Thank you for reading.