So I got curious after not receiving any notifications for 7 (now 8) hours. I ran a little test with the help of another user and it turns out notifications are indeed not working at the moment (at least for comments and articles). Support is aware of it and it is hopefully gonna be fixed by tomorrow: https://civitai.red/issues?id=41
Regarding enhanced compatibility in the generator failing without refund, there is already a fix on the way, but it's pending review, so hopefully this also will be fixed at the begin of next week.
Update (8th of June 2026 17:00 UTC): New notifications started to come in about 10 hours ago and the ones I missed out on seem to have been restored. However I haven't received any new notifications since 6 hours, so notification system is still not working properly. Hopefully getting fixed, when work on the generator is done.