Can't Trigger a custom Apple Keyboard Shortcut due to Touch Bar

I have a custom keyboard shortcut set up in Apple's System Preferences for Safari (CMD+OPT+O to show Tab Overview).

Everything was working completely fine and then all of a sudden today the shortcut stopped working and BetterTouchTool displays the following message on the Touch Bar- "You have not yet configured actions in BetterTouchTools. I don't want to set any instance of CMD+OPT for BTT and cannot seem to find a workaround. The strangest thing is that it was working perfectly fine for days and then all of a sudden today it stopped working. Nothing had changed in BTT or macOS.

Any ideas? I can send screenshots and more information if necessary.