Asking anarcho-communists "you're leftists so you support [party self-labeling as 'left'] right?" is so history-less.
Yes, in conflict anarchists tend to cooperate with any less imminent authoritarian threat,
but does not mean we support parliamentary shenanigans.
We choose whom we cooperate with, when and why on individual basis.
Even cooperate with authoritarian "communists" (albeit an oxymoron) sometimes because some see a greater strategic threat elsewhere, but know as they cooperate with Trotskyites it means expecting a dagger in the back, as with Stalinists means ice-pick in your neck and we joke about it until those that fight FOR power instead of against sense it graspable.
That's when anarchists know treachery becomes party dogma, or should've in the past, when "allies" came at us red not of commune but of us slaughtered at the front with stabs in the backs.