I have some inconsistent issue on chromecasting.
All the devices in the example below are signed in as same account,
which means both devices A and B has the same full access to the library.
Song A will chromecast from Device A to Device B, and also from Device B to Device A.
Song B will chromecast from Device A to Device B but wouldn’t from Device B to A. I see no progress of the playback.
Let me focus on Android device for now.
Song A will chromecast from my android phone with a plex app to
a Android TV device with a plex app.
But for song B, it wouldn’t cast from my android phone to android TV.
In case when casting doesn’t work, it opens up plex on android TV,
even plex is already launched, and just stays there.