When enabling the Minify feature of the WP-Optimize plugin, Bricks won’t load. After 1-2 minutes with a “busy” icon in Chrome’s tab bar, there’s a 500 error.
Oddly enough, when setting “Disable Minify for logged-in users” on projact.asb-hessen.de, the builder still won’t load. When clicking on “Edit with bricks”, the entire page immediately turns white (the the WP admin bar remains visible).
If you use Cloudflare on your installs, I would offload all your minification to Cloudflare as it is not done on your server like the majority of caching plugins such as WP Rocket, so it saves a little on resources. That being said, I am not familiar with WP-Optimize and how they do their caching.
But using Cloudflare for the minification should also overcome the conflict you are experiencing as well.