If I insert a thumb drive into my Lubuntu 24.04 laptop, it shows up in the Removable Media widget in the taskbar. If I click on the mount icon, it mounts, but EasyTag and logisim-evolution both start; EasyTag opens and sets it's current directory to the root of the thumb drive, logisim-evolution just shows the splash screen and exits. This behaviour is consistent with them invoked with the mount point of the thumb drive as a command-line parameter.
I checked my file association in lxqt-file-associations, and inode/mount-point is mapped to PCManFM-Qt.
How to get this Lubuntu is just mount the volume without start seemingly random apps?