no, the extension is done in thailand, whenever you leave thailand you get a re entry permit cost 1000 baht so youcan re enter on your existing visa or extension. You will now start again in france for a new visa
Samesame me ..this years glitch was the addition of 2 (!) Photos inside the house ...koh phangan ... and the hold passport time is down from 7 days to 5 days 🙄
In theory within 24 hours, but there are no checks so any time seems ok. Major requirement is to have a valid one for any immigration office visits eg extensions etc