Custom shortcuts with super key are hit-or-miss

[Nathan Teodosio]

Some custom shortcuts with super key will not work. The failing ones I found:

Super + {1..9}
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These will say

> Super+{Number} is already being used for Activate favorite app 9. If you replace it, Activate favorite app 9 will be disabled.

That is not what happens though; rather the old binding is not relinquished.

Super + o
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Assigning this gives no such notice as above, however it is assigned disable orientation lock.

I followed the answer in https://askubuntu.com/questions/1179858/disable-orientation-lock-shortcut-super-o-in-ubuntu-18-04-gnome, namely

  gsettings set org.gnome.settings-daemon.plugins.media-keys rotate-video-lock-static []
  log out/log in

and now the shortcut works.

Conclusion
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gnome-control-center should either say it's not possible to map such combinations or honor the override.