This has been similar back in IL2 as well, but in all honesty it's not that uncommon when flying in formation (i remember years ago someone posting a wartime training video from a USAF flight school which emphasized the use of rudder for formation flying).
I think that it's a case of sacrificing some aerodynamic efficiency in exchange for keeping wings in a more level attitude to maintain visual contact, instead of banking in a sharper angle and losing sight of half the formation under the lifted wing.
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