Side-panel Teams meeting app becomes unusable but stays open/visible when user joins a breakout room

I am working with a side-panel Teams meeting app. A customer noticed behavior that I have been able to replicate but have not found an explanation for, or a way to prevent.

Issue summary

When a user has a side panel app open, and the user is pushed into a Teams meeting breakout room, the side panel app remains open/visible but the app content disappears (making the app unusable).

Replicating this behavior

1. User has app open in Teams meeting side panel.

In the below screenshot, note that the app is listed in the interface (red circle), and open in the side panel.

Blurring added to video and app content space for privacy.

2. User is pushed into a breakout room.

The user does not interact with the interface and is automatically pushed into a breakout room.

3. Upon joining the breakout room, the app appears to remain open in the side panel, but the content disappears.

In the below screenshot, note that:

• The side panel app content is now empty/blank.
• The app icon disappears from the Teams meeting interface (red circle). This is expected, but just want to note that the app is not attached to the breakout room at all.

Blurring added for privacy.

Thoughts

My understanding is that apps don't carry over from the main Teams meeting into breakout rooms (though apps can still be added inside of breakout rooms), so the curiosity here is why the side panel app remains open when moving from the main room to a breakout room.

And one more interesting note —  using the three dots and "Reload" on a side panel app gets the app to reload and work again inside the breakout room, despite the app not being listed as an interface tab within the breakout room.

(This returns the app to a state like you see in Screenshot #1.)

I don't necessarily need the app to remain usable as a user joins a breakout room, but I am wondering what's going on here with the app remaining open/visible.