I’m pretty sure it was a standard install, I did it 7 years ago or so following the Ubuntu guide at the time which at that stage I think it was installed 18.x LTS. It’s on Ubuntu 20LTS + Docker as I type now.
Yes I switched back to proxied but with all minification disabled. No change.
Update: Turned off caching for the subdomain with a page rule. We’ll let that percolate for a while.