Bookings personal page shows incorrect times, not my "regular working hours" from settings

I'm having the same problem.  Checked my time-zone settings in as many places as I can think.  

By way of a test as to what the bookings page thinks my regular meeting hours are, I changed the settings on a meeting from custom to regular, and it changed Monday to Friday to all be 09:00-17:00, despite my regular meeting hours in Outlook being 10:00-15:00 on Mondays and Fridays, and 09:00-17:00 on Tuesdays, Wednesdays and Thursdays.  Where is it getting those regular hours from then?

Regular work hours from Outlook

Bookings app shows slots before 10am on Friday ...

... and beyond 3pm

If this was anything to do with time zone, then I would expect the morning to start an hour earlier or later than planned, and an equivalent adjustment at the end of the day, but  it has extended in both directions.

What is now really annoying is that, in trying to correct the availability on a private booking page, it seems to have generated a new booking page link, and so those that have already been emailed have a broken link! 😒