An image = 1000 words, so here:
This issue is not new, here is another post about it: https://community.spotify.com/t5/Desktop-Linux-Windows-Web-Player/Spotify-stuck-behind-taskbar/td-p/...
The issue happens you open Spotify for the first time. The desktop window appears under the taskbar.
On reddit a user said:
It happens with some win32 apps that don't remember their position and aren't aware of the top taskbar. They appear underneath the taskbar sometimes, Spotify is one of them.
Please fix this is very annoying! 😭😭😭