Key shortcut misbehaviuor

[antanasb]

Hello,
I'm using Lithuanian Standard (AZERTY) keyboard layout. Speaking about navigating between workspaces all shortcuts are working perfectly (switching and window moving), as well as using US keyb layout, with one exception: I can't move a window from any workspace to the 2nd workspace (using Shift key). Switching to 2nd workspace (without Shift, hence Super+2) is fine.
If it's relevant the key which gives "2" in US layout, produces "-" (minus) in lt_std layout. The digit "2" is on the second level (Shift+2).
Where I can check for misconfiguration in config files or elsewhere?
Ubuntu 20.04 here with regolith-desktop v. 4.2.0 on top.
Thanks