The old server: Welcome to Ubuntu 18.04.6 LTS (GNU/Linux 4.15.0-194-generic x86_64)
The new server: Welcome to Ubuntu 22.04.1 LTS (GNU/Linux 5.15.0-50-generic x86_64)
Could it be related to that?
I try to rebuild the new server by
cd /var/discourse
./launcher rebuild app