When clicking "Duel" button in Duels, and when clicking Send Challenge in League, the game doesn't tell me I'm waiting for a game like it did at the top, which also means I can't click "cancel" if I want to cancel my request.

To add to this, because I couldnt cancel, I was still technically queueing, which means it dragged me out the custom game I was in to fight Anjovi who started queueing for a league game

I noticed that after queuing, it didn't show the 'waiting for game' prompt either, until i went to spectate gary's game. Afterwards, the prompt seemed to have regained normal functionality, prompting me whenever i joined a queue afterwards.

joining a realm also seems to fix the problem