Daniel, your “solution” achieves the first part - deleting the blank page - but screws up the next 30+ pages of music!
When I inserted the blank page all the master page changes and overrides shifted back by a page, automatically.
Deleting the overrides to delete the blank page leaves all of the master page changes and overrides in their new positions, but brings the flows forward a page. See gif below:
Should I start wading through backups at this point?