On Xbox:
For at least 6 months, there has been a bug where some players in the match will be completely removed from the chat from one persons perspective. I play with a group including someone who is usually sitting next to me, and I regularly cant see chats that they can, even though I can see other chats from other players. I also cant see chats from the group member I play next to. These people havent been squelched, and it also impacts being able to see the chat line that says they switched characters.
I bet more people are impacted by this than realize it, because its not obvious sometimes if its happening.