iOS 17.3.1 Contact Photo not showing in full screen for contacts where poster is not set up

I have hundreds of contacts with a contact photo for each of them. At the initial version of iOS 17, all those photos were appearing as full screen while calls were incoming. However, now at iOS 17.3.1, only the contacts with poster set up are showing as full screen photo/poster.

Now its almost impossible to set up poster for all the contacts I have. Moreover, I don't have that specific (say favorite) photo of a/any person that was set up as the contact photo previously.

Developers might think that contact photo must not appear as poster, but I think it should be users' choice whether it should appear in full screen or not. In the previous version of iOS, all the contact photos were appearing full screen afaik.