I have an issue in GNOME where new workspaces are not created or removed on demand. After I press CTRL+ALT+Left/Right (switch workspace) or CTRL+ALT+SHIFT+Left/Right (move window between workspaces). This error happened after the update (GNOME 43.5). In between I tried to switch from X11 to Wayland to try something out, but disabled Wayland afterwards and enabled X11.
Welcome to the forum! 
Make sure you have Dynamic workspaces enabled under Settings > Multitasking
Thank you for your welcome @Yochanan !
Yes, I have Dynamic Workspaces enabled.
I think this is a bug from GNOME, because it only stops to work on CTRL+ALT+Left/Right (switch workspace) or CTRL+ALT+SHIFT+Left/Right (move window between workspaces).