This is #765669 causing libavifile-0.7-dev to be uninstallable after binNMUs. According tohttps://ftp-master.debian.org/deferred.html a fixed version will be available in a day.
This is a bug in the avifile source package: https://bugs.debian.org/765669 <https://bugs.debian.org/765669>
Oh thank you for this informations. Next time, I'll check the bug's list before ask. Best regards, Corentin

