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.
"Why do anarchists hate voting?", some ask.
They must have had teachers intent on teaching opposite of truth.
Anarchists want you to, in a form or other, vote on everything in your life, always, by vote or act, just... not only every 3/4/5 years and then be violently blocked from ruling your own life, unless they happened to be one of the few already empowered enough to be able to run for mandates that wasn't for them to take nor for any other of the parliamentarism voters to give away, just existed because some dead white dudes said long ago it's the only way to self-govern, while part of the ruling-class.
Or, you know, you COULD have representatives too in some forms of anarchism, but only if their representation was immediately revocable, as otherwise it's not representative at all, just as "representative democracy" is not representative but is directly anti-democratic.