No. You are incorrect.
You could always hear and record game chat in clips taken directly via Xbox, you can't hear or record your own voice but you can hear and record what others are saying in game using game chat.
And you could always hear people talking using game chat when you are in a party. You obviously can't talk back but you could hear what a person in game using game chat was saying.
I have hundreds of clips of both circumstances that I can send you.
This has changed since the last update you did.
And we still have the issue of game chat not being heard in live streams. Xbox streamers are really suffering right now because viewers can't hear what players are saying.
Please have someone look at this in your department that plays Dayz on Xbox

Game chat in Arma works. Doesn't seem to be a twitch issue either as clips taken directly via Xbox don't include game chat either.
Definitely Dayz only.
Really need this fixed guys.
Xbox players, streamers and content creators are really suffering atm. Quite boring watching someone stream and only hearing the streamer talk and not other players.
You can view on my twitch vods (SmileysGotAGun) and other Xbox streamers such as TheGreedyPeasent and Half_Goblyn.

Please please please fix it so we don't have to hold down a button to talk in game on Xbox. It is impossible to be social and interact with people if you have to hold down a button to talk whilst trying to use your inventory. It's actually making the game antisocial as more and more people are not using it and only talking to people in their party chat.
More people are playing on Xbox since being on gamepass. Soooooo many people on Xbox want that fixed.