The extra pages are created because of the use of the slash (/), which is reserved for namespaces (a relatively recent feature). One way to avoid their creation is to change the format of the date (in Settings → Editor → Preferred date format, then re-index), so as it doesn’t contain a slash. As about multiple-pages filtering, selection, deletion etc., they have already been asked in various Feature Requests and will hopefully get implemented one day.
Selecting a date format without slashes resolved the issue for me.
The list of date options in settings includes slashes as an option as of July 31, 2023.
Pardon the newbie question - what’s the appropriate way to make a maintenance item request to have the list of date options refreshed, vs a new feature request?
Thanks