Any councillor should / could have called a point of order BEFORE the vote was proceeded and quoted standing order 1(s):
Before an original or substantive motion is put to the vote, the chairman of the meeting shall be satisfied that
the motion has been sufficiently debated and that the mover of the motion under debate has exercised or
waived their right of reply.
This is a not uncommon "sharp" tactic by certain types of Cllr when they may wish to rail-road a particular course of action or outcome.
The main culpability lies with the chair for allowing the motion to be proposed, seconded and voted whilst there are Cllrs that may feel they have not fully debated the motion. You say it was voted on and it wasn't voted on?
Unfortunately, some responsibility also lies with those that could of, but didn't, either see it coming or grasp it before it was allowed to go too far.
You could potentially present an argument that the chair (and possibly the others) "...improperly used their position to confer an advantage or disadvantage on themselves or another.." but it is likely that the MO would simply bat this off since it was a decision of the council after all.
It's a "sharp" practice, you have to be alive to it and not allow it to happen again - if someone is obviously pushing to get to the vote there is probably something they are trying to avoid coming up...