Hijacking the top comment to mention (as posted in more detail below) that this actually has a very logical explanation. In short, Biden also got 0 votes in some precincts, which was a total flip from 2016 where Clinton won by large margins. The difference? The community is 100% Hasidic, and community leaders met with Clinton during her Senate race while Bill was president. During this time, there were community members being indicted for a fraudulent Hasidic school. The community voted for Clinton for Senate, and shortly after Bill commuted the sentences of these community members. I.e., very possibly a quid pro quo. So that community in particular supports Clinton for this very specific reason, when Trump was still a relatively unknown quantity, and then flips to support Trump for his very aggressive support of Israel during his first term. I despise Trump, and would love him locked up, but these are cherry picked numbers that prove nothing.