KevinTheJedi On this server not really, but composer is working and I'm not using composer to install osTicket, I'm using the official zip file.
I was previously on v1.17.2. I tried three times v1.18 with the same result. Now I tried v1.17.4 and it worked without problems, so I guess I'll stay on this version until I have more time to check this out.
I'm on Debian 11.7, maybe I'll try in a few days on Debian 12 with PHP 8.2,...