When going into the news feed for an offline realm it shows as online after backing out.
Steps to replicate:
Press play and go onto the friends' tab
Open the news feed for any offline realm
Back out and it will appear online but error when trying to connect
The expected outcome is that the realm still shows as offline
This does not affect realms that appear in the Worlds tab
Video: Realms News Feed glitch.mp4
Since the release of 1.20.81 I have only been able to replicate this issue by loading into Realm Stories of a Realm that is owned by the player but in an "expired" state, then by going back onto the Friends Tab, all Realms once again appear online.