Ctrl+Alt+Up/Down leaves garbage in terminal

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I am experiencing an inconvenience that I had not experienced before upgrading to Fedora 31, or at least so I think.
Switching desktops with Ctrl+Alt+Up/Down while the focus is on a Terminal window sometimes puts A and B characters into the terminal (as well as ringing the terminal bell), the same as if only Alt+Up/Down were pressed.
Has anyone experienced this, or am I being clumsy?

Include some more info: what terminal emulators do you use? Did you check the keyboard shortcuts and were these shortcuts active? If the shortcuts are not assigned in settings / devices / keyboard shortcuts, the terminal will interpret them as characters.

For me the keyboard shortcut for moving to a different desktop is super+pageup and ctrl-alt-arrow combo’s are not assigned.

Hope this helps.