When you change the community path in Library (When MFS24 is running) then the new community folder will be created but it will be empty. What you have to do is, to install the addons again.
In my case i have for now only Navigraph and GSX PRO. I oppened Navigraph and it found the new community folder automaticaly, so i just hit INSTALL. The same with GSX PRO, i started the GSX launcher, and i click to relink or something like that, and then it found the new community folder and did the install of the mod.
Then i checked the new folder and yes everything is there. So it works fine…
PS: WHEN YOU CHANGE THE PATH, YOU HAVE TO MOVE YOUR ADDONS TOO OR REINSTALL THEM TO THE NEW PATH.