I am assuming you are referring to meetings held in Wales as these permit hybrid meeting (where councillors and the public can attend remotely). I am not based in Wales so unfamiliar with the wording of the legislation but if the council has resolved that a recording is taken for the purpose of aiding the minutes, then I would expect (a) that the record is retained until the minutes are agreed and (b) that therefore the record should be available to be reviewed up until the minutes are agreed. Once the minutes are agreed then the recording should or probably is no longer retained as Minutes are regarded in law as being a true record of what happened at the meeting.
However, perhaps it is more pertinent to ask what is the dispute? Is it a question over whether a resolution was actually made or is it that there is a disagreement about the nature of the drafting of the minutes? Minutes are not and nor should be a verbatim record of proceedings and in my clerking days I was always told they should be a record of decisions with just enough additional text to give context to the decision. Some councillors do seem to think that their long statements should be recorded verbatim and this is where disputes on "accuracy" sometimes occur.