when updating availabilities in "shared availabilities", the availabilities I previously recorded "hide" my calendar.

For instance, I thought I was available on Friday in the morning.
I added a meeting via Google Calendar from 10 to 11 am.
I want to update my availabities.
The whole Friday morning is “covered” so I have to delete the whole availabity slot, then recreate it again.
Maybe some kind of transparency would help