Contacts Birthday field format
The Birthday field in the contacts manager seems very restrictive. It only accepts typed dates in the format %E %b, %Y (e.g. 18 Jan, 2021). The data entry field is extremely inflexible when typing dates. For example, typing the full month name will result in the field being rejected and not saved. This could definitely use some more robust date parsing and should allow other date formats to be input. When I try to save a bad date, silently rejecting it is the wrong move because I have to reenter edit mode and re-input the entire date instead of simply correcting the error.
Also, another minor annoyance for a linux user: pre-filling the birthday field with the current date is of limited usefulness and actually hindered me. I was trying to copy dates from another source using the middle mouse button buffer and the web page kept restoring today's date in the field when I would erase it and change back over to the other app to copy the date. It's very unlikely that anyone would be creating a contact entry for someone born on the same day they're creating the entry. It's much more likely that a new contact has a birthday in the past. This date field should not be pre-filled and should instead should use placeholder text so when I first click in the field I can immediately type or paste new data without having to erase pre-filled text that is 99.999999% likely to be wrong.