It does it even when nothing else is plugged in, and I've had occasional crashes since I got it 5+ years ago (so, across multiple MacOS versions).

TBH, the crashing when plugging/unplugging, HiDPI issues and general ugliness and clunkyness are far more annoying tho!

I’ve got an LG28” 4K on a 2019 MBP. I’ve never experienced a crash but the monitor will sometimes flick (lose video for a second, sometimes it will also auto lock). Just once or twice a day, so no biggie.

It took me awhile to configure my monitor correctly, and the color is still off. I got my wife the 24” 4K that Apple recommends and it has been much better for her (as a designer, she wouldn’t have put up with wrong colors).