they switched away from big yearly updates to smaller, more frequent updates (or "drops", as they call them) some time ago, and they used the same versioning for those small updates and for hotfixes. so it was:

1.21.update-or-hotfix

now we have:

year.update.hotfix

i think it’s clear enough for what it is, even if it’s non standard it makes sense for minecraft’s new update schedule. 27.3.2 is the 2nd hotfix for the 3rd update of 2027