The purpose of the minutes is to record the decisions taken at the general meeting, for each agenda item. If there are doubts about what happened, then the motion to confirm the minutes put to the next meeting can resolve any issues. The easiest approach is to look at the previous Agenda and mark which were approved, or not (if a motion does not receive sufficient votes (ie 51% for a normal resolution) then it fails. If the members who attended can’t recall the outcome, that mark consider those items as being deferred or voted down. Add any items that should be resolved to the following meeting’s agenda, with the explanatory note, that this item was brought forward from the previous meeting.
A general meeting is “valid” if there is a quorum present, and it begins and ends. If all the agenda item decisions are unknown, then consider the decision for each one as being deferred, and take this up at the next meeting.
Note that the minutes are in essence a list of the answers to the agenda items – basically “yes” “no” or “deferred”. The minutes should not record discussions, comments, questions etc – just the decisions taken. And later meetings can revisit those decisions and change them or reassert them.