Sorry for the delay.
After tests, I only have this behavior with Enpass (if I change the display mode, Enpass opens in full screen while it is minimized in the taskbar corner). For me it's an Enpass bug, because there is this behavior only once per boot.
I don't understand when you say you have the same with Chrome or Notepad.
I have other applications in the taskbar corner (Steam, Spotify, Roccat Swarm, iCue,...) which don't open if I switch to single screen / dual screen.
I tested on my work computer running Windows 11, and I have this problem too, and only with Enpass. For example, my company's password manager (1password) doesn't open.
I made a video of my screens so that you better understand the problem (https://youtu.be/-zivczTnkxo)