Rav Nachman from Breslov also writes as an example of how tzadikim can err, that there were Italian mekubalim who held that in chutz la’aretz, one should not have a beard, because of its kedushah. Rav Nachman writes that the world makes two mistakes about tzadikim; that they can’t make a mistake, and that if they do, that they’re not tzadikim.
Obviously it’s not our place to judge who made mistakes, but the gedolim tell us things like the above examples, which we are supposed to listen to. It’s extremely rare and not something that helps our emunah to dwell on, because the entire Torah is based on mesorah; we have emunah shlaima that the mesorah is authentic and that people who learned torah lishma were guided min hashomayim to transmit the truth to us. There are these couple of exceptions, but the exception proves the rule. 99.9% of the time we say it’s a machlokes and move on without saying one is right or wrong.
Syag; I believe I’ve made it clear in the past that if someone shows me sources that prove me wrong, I yield. The only time I wouldn’t is on things that I have been mekabel directly from my rebbeim as a mesorah; including zionism.