I think that Joplikn IS starting it's just that the tray icon no longer appears (or is there but is too small to see or click on). As my link above shows @laurent states that this appears to be an upstream issue with the Electron framework Joplin uses.
So Joplin is probably starting minimised and the "second start" is just bringing it up from the tray.
I use Linux Mint so I can put a shortcut to Joplin on the desktop. Clicking on that opens Joplin a bit like clicking on the system tray icon. Unlike the system tray icon you don’t have to right-click & " open", just double-click and it opens the minimised Joplin.