Often, one player leaves (and someone else joins) the crucible match and the connection suddenly changes. After that moment the gamplay changes. Bullets suddenly don't do the same damage....... or the opposite.
The same on my own fireteam: If one person is on my team, I can't make a kill. When that person leaves, I'm suddenly MVP every match.
I think that this shouldn't be happening in a 2022 A+ game.
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peer-to-peer connections with rotating hosts is what causes it.