How to remove/change profile picture on avatars-fast.yandex.net?

Question

Yandex

As far as I understand, when a letter arrives at the Yandex mail, a profile is created at the sender's address
in which, in particular, the avatar is stored:
https://avatars-fast.yandex.net/get-profile-avatar...
(eg #hash# =d78b6ca0380f60555a86c07b1bd5bc6f)
Again, as far as I understand, one of the sources of these avatars could be gravatar.
It so happened that, to put it mildly, not quite a good picture was cached.
How to remove/change it?
Changing the picture to gravatar and sending emails from the correct address didn't help.
Perhaps there is a period after which the avatar will be re-read. Is he there?

Answer 1

Updated once a week.