Problem modifying a meeting - can't change recurring meeting to non-recurring

[DuvieIAH]

In 2020 during the early days of COVID, using the Zoom website, I created a recurring meeting/no fixed time for a study group that meets weekly.  Separately, I created a recurring meeting in Outlook and set the location to be the Zoom meeting link/URL.  The Outlook meeting repeated for 6 months then I created a new Outlook meeting for the next 6 months....  This worked great for years.

Earlier this year, in Zoom, my recurring meeting magically changed to separate meetings once each week, matching the meeting cadence in Outlook.  This was unwanted behavior.  I made no changes in Outlook.  At the time, I had integration turned on so Zoom would see the meetings and display a notification to start the meeting (on Windows 11 Pro).

I've been advised to turn off the integration on both sides (which I've done) to address a related issue.

I've tried changing the meeting in Zoom to non-recurring via the Zoom website - cleared the recurring check box, saved the change, still recurring.

Deleting this meeting  and creating a new Zoom meeting to replace it could be a simple solution but it isn't an option - the link has been widely distributed and the participants are mostly very non-technical - switching to a new meeting link will confuse many of them.

How can I get this Zoom meeting to be non-recurring (so I can restore it back to recurring/no fixed time)?

[Current versions of Zoom Workplace app, Outlook/Microsoft 360, and Windows 11 Pro.]