Hello,
I noticed that now we can configure virtualmin to use php-fpm without having to do it by myself, that's great, but I noticed you used: ProxyPassMatch I had an issue few months ago with that, where it would crash when trying to load some php scripts, instead, it was recommended to use:
<LocationMatch "^(.*\.php)$">
ProxyPass ...
</LocationMatch>
I'll try to see if that happens again, but sadly I don't remember where I had the issue.
Also, when I select php-fpm for the server, I can't select php version anymore, the error is because the server is using mod_php, which obviously I'm not.
"trying to load some php scripts" ? just your sensation...or something wrong. Never happened because it's not an issue... the problem may be somewhere else, instead. Eg. they confused pm.max_children in place of pm.max_requests setting max_children too high, that's insane and may crash the server for sure... ProxyPassMatch has nothing to do with the crash