Command-6 shortcut doesn't works
I have a problem with my new MacBook Pro and OS X Mojave: I've using my own shortcuts Cmd-1 to Cmd-6 for switching between Workspaces since Ubuntu Linux in 2009, thru Leopards, Lions, Sierras. But after buying new MacBook with Mojave I've faced with problem that all of the Cmd-X shortcuts works fine as earlier but not Cmd-6 (Cmd-7 for switching on 7th workplace works fine too). There is no any conflicts in Shortcut settings, it is just didn't work and there is sound «Blah» on press Cmd-6 like when disabled combination is pressed (in some cases it works as default shortcut for current window).
It seems like minor bug but it is very annoying me because I have perennial workflow based on those shortcuts.
Please, help to find solution.
MacBook Pro 15”, macOS 10.14