Send shortcut to specific app (Microsoft Teams) action not working when app is on the foreground

Describe the bug
So, I may have found a very specific bug with the send shortcut to specific app action.

I'm trying to set up a global shortcut to mute/unmute Microsoft Teams even when I'm not viewing the app.

My trigger and action are defined as follows (note that I've checked "differentiate left/right modifier keys") so that when I press "right option + M", it should send "cmd+shift+M" to the Teams app. Quick note here: I've configured BTT in a way that maps my caps-lock key to right option and have been successfully using it as kind of a hyper key.

This action works perfectly fine if Teams is not on the foreground. However, when it is, the microphone is not being muted/unmuted even though I'm sure the action is being executed since the HUD overlay is being shown.

I've also verified that everything works if I uncheck the "differentiate left/right modifier keys" AND use the left option key. It still doesn't work with the right option key — in this case, caps lock.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):

Device information:

  • Type of Mac: iMac (Retina 4K, 21.5-inch, 2017)
  • macOS version: MacOS Big Sur Beta 11.2
  • BetterTouchTool version: 3.505 (1643)