Another one here ... also Mac Mini 2010 (bought 2020) with the exact same behavior as described above ... this started after i updated to 12.3 yesterday.
LG 32" 16:9 Monitor connected via HDMI
Philips 49" 32:9 ultrawide Monitor connected via USB3/DP Adapter
Native Screen Resolution on 49" was recognized anymore and after some reboots now it seems as if the mac does not even see the connected Philips monitor anymore. Only the HDMI Output works.