Turns out Robert’s Rules do recognize that a year between meetings is too long to make effective corrections to minutes:
When the next regular business session will not be held within a quarterly time interval, and the session does not last longer than one day, or in an organization in which there will be a change or replacement of a portion of the membership, the executive board or a committee appointed for the purpose should be authorized to approve the minutes. The fact that the minutes are not then read for approval at the next meeting does not prevent a member from having a relevant excerpt read for information; nor does it prevent the assembly in such a case from making additional corrections, treating the minutes as having been previously approved… (RRONR 11ed §48, “Reading and Approval of the Minutes”, 474-475)
So the session ought to approve the minutes of the annual congregational meeting, presumably at their next session meeting. Not to worry if the need for a special congregational meeting pops up within three months: “A special meeting does not approve minutes; its minutes should be approved at the next regular meeting” (473-474).