The sad thing about not remembering windows is that if you use spaces, you also never quite know where things will launch again on restart. I'm not even sure there's a definite pattern. Mail mostly goes into the right place, but sometimes don't.

Closest thing I noticed is that apps that have a "splash screen" of some sort (could be an update check, etc) will always fail to go where they are supposed to. This includes Discord and Xcode very reliably. Sometimes point releases make things worse.

Also, I think there's quite probably some firmware/hardware issues with screen detection on the M1. I do have a USB-C Studio Display which works mostly fine, but I also have a (I admit very odd and not quite new) Asus 4K display that uses Multistream Displayport. Connected via a USB-C to DP cable (protocol wise, it's supposed to be the best case scenario as VESA joined up to USB-C).

On my M1 Mac Studio (and something I can't reproduce with other hardware), that display will regularly not wake up from sleep and plugging/unplugging to another port will work maybe half the time.

Most puzzling also, if my Mac goes to sleep, periodically the Asus display will wake up for a few seconds (just going back to standby with backlight on), then go back to sleep. I never timed it but it's at least once an hour, and always does so.

I also had a few bug reports of people having issues with various USB-C docks where my screen saver (Aerial) just gets told the screen isn't there anymore and to go away, and people then see a blank screen on that one, and it never comes up again with the screen not on standby, but just displaying black with background on.

Considering it's been happening since I got the M1 and not on previous Macs (and most reports were on M1 I believe), I have a feeling there may be a few firmware/hardware USB-C issues laying around. Maybe it's been fixed since ?