Thanks for pointing me in the right direction of how to find the logs.
I ended up (planning to) switch to the Docker version to run 4.2.0, I’m aware it’s old / EOL / unsupported / unsafe / etc., but it’s going to be used for two to three users, behind a VPN, in a non-production environment, for only unimportant conversations that won’t impact anything if they were suddenly lost, so I’m fine with staying on the old version for home and “latest” at work.
Docker in a Proxmox LXC container is going to be a lot “lighter” than a full VM running a snap anyway.