The option to chose quality gets pushed outside of the window in popup mode when there are too many quality options and they don't fit on the screen. Heres a video of it: https://upload.cat/b51101a765df26ae
Running on Android 9 if that matters.
I can confirm this starts to happen when you place the popup _just_ low enough on the screen that the resolution selection popup won't have space to show fully. In that case, it opens upwards (naturally) but for some reason, it gets cut off at the boundary of the popup window.
I no longer experience this in the latest version (0.19.8). I have also since then moved to Android 10 so it might be that. OnePlus 5T running mostly AOSP.
Does it open fine upwards?
Yes, I tried getting it as low as possible before the quality select goes up and it works as intended.
Then it probably happens for Android 9, and maybe other versions. Thanks for checking.