Pop-out-app feature shows inconsistent behaviour with different themes
It's hard to pinpoint the cause of this issue, but I noted the Pop-out-app window doesn't apply the dark theme in my add-ins implementation, while it does inside the regular i-frame. Trying to reproduce I checked different apps, such as Polly (refer to the appended image), and noted the same behaviour: light theme is applied when dark theme should.
I opened an issue in the Teams-SDK-Repo, but the theme change hander actually works as expected.
You may notice similar/slightly differently unintended behaviour in other AppSource-add-ins as well, such as App Studio.