I just bought a small portable 1080p 14" USB-C Monitor to use with my 2019 16" Macbook Pro: https://www.amazon.de/ARZOPA-Tragbarer-1920x1080-Bildschirm-Telefon-Silber/dp/B09Q2WYRKD
For some reason, when it's plugged in, the monitor powers up, then immediately says 'No signal', then my Macbook Pro locks up where the mouse freezes, screen goes dark, then appears back much darker and is just frozen.
As soon as I unplug the monitor, the laptop is perfectly usable again immediately.
I recorded console logs and noticed a few errors that seem relevant:
default 22:03:10.708481+0200 WindowServer [WARN] - IOFBSetDisplayModeAndDepth: Failed to obtain mode info from IOFBGetDisplayModeInformation() default 22:03:10.708554+0200 kernel [3:0:0] [FB:0] AmdRadeonFramebuffer::getPixelInformation() !!! Invalid display mode: 0xc0003068.
Plugging it into an M1 Macbook Air works perfectly so it isn't a hardware/cable issue and both machines are running Monterey 12.3