Hi John!
Just wanted to share with you that a new release of our plugins is out, where we added a message to warn users about the URL changes when breaking an event out of its series:
“When you break events from a series their URLs will change, so any users trying to use the original URLs will receive a 404 Not Found error. If this is a concern, consider using a suitable plugin to setup and manage redirects.”
You can find out more about this release → https://theeventscalendar.com/maintenance-release-for-the-week-of-9-september-2018/
We are currently working on improving the recurring events functionality altogether, so the URL change is likely to be solved in the near future. Until then, we suggest setting up a plugin to handle the redirects.
We apologize for the delay in getting back to you. Let us know if you have any follow up question.
Best,
Victor