When typing gg at the end of a game my message didn't go through, even when I tired again; this happened in the game before too.
Match id:21723973
I don't have comm restrictions
screen shot proof:
I'm unsure but this may be in order to curb toxicity at the end of matches, but if so I don't like it. Not being able to say gg and chat with people at the end of matches makes the game a lot less personable, and toxic people can just be reported and banned/restricted.