Thunderbird View "Day Starts at:" option not working - Toggling between Inbox and Calendar tabs causes calendar to always scroll back to starting at midnight

I have recently being forced to update to Thunderbird 68.4.2 on my workng machine (and lost access to Rikaichan....but this is the topic for another posting) and noticed that everytime I moved between Inbox or any other tab back to the calendar view last view I had on my calendar was lost!

I was trying to fix this behaviour by going to Tools->Options->Calendar->View->Day starts at:
and then setting the start time to 7am so I could see something like this:

However the view would always be different than that!

I found the following references to this bug here and here but no good fix.

Some of the answer you can find on the first link:

Thanks for reaching out. I think thinks are different in 68.0. The start time refers to when the work day starts (which is time range with different shading). There is no setting view start time.

and

You're right, there's no setting for the start time - it's midnight. But I note that the scroll bar position in Day or Week view is remembered between TB restarts, so that if the window was scrolled to show 8:00 a.m. at the top at TB exit, it window looks the same when TB is restarted (TB 60 & 69b). Does that at least work on your system?


One of the recommended fixes was to scroll the view as you wanted and then close Thunderbird, so that setting would be saved on session.json but other viewers tried and it did not work.

I think I found the problem, if you made the changes but goes back to any other Thunderbird page (like inbox) before it closes the settings for the view are lost. What I tried and worked for me was set the view on the calendar tab and then close Thunderbird from that view. This has reset the default view to my last one!

I just wish Thunderbird would have this fixed instead of having us need to create work arounds for something so trivial.