Keyboard layout automatically deleted after trying to change it on the login screen

Distribution

LMDE 6

Package version

6.2.9

Graphics hardware in use

AMD Radeon RX 6600

Frequency

Always

Bug description

Two layouts: English and Russian.
Even if I enabled "Alt + Shift" combination in the system, the login window doesn't change the layout using this combination. After trying to change it manually (on the top), the layout also doesn't change but (sometimes? Can occur after using the combination again) the layout choice disappears. After logging into the system there is only one layout remaining and the other is removed (so, there is no layout selection in the panel). Also I can't add new layout back because the "Layouts" tab removed in the keyboard settings window.

Steps to reproduce

Manually change layout on logging screen and try to use the layout selection combination and login to the system.

Expected behavior

The layout shouldn't have been disappeared and it's selection should have been worked with the combination on the login screen.

Additional information

No response

No files or tests are identified. Reproduce the issue on LMDE 6 with package version 6.2.9 from the login screen, then trace keyboard layout switching and persistence; done means Alt + Shift works there and both English and Russian layouts remain available after login.