As the PIL report indicates AVIF support is, apparently, not installed. However: PIL does log that it's importing its plugin: DEBUG - Importing AvifImagePlugin libavif is installed on this Arch ...
OS: Debian Trixie Python: 3.12.5 Pillow: 10.4.0 # python3 -m PIL.report ----- Pillow 10.4.0 Python 3.12.5 (main, Aug 22 2024, 13:11:09) [GCC 14.2.0 ...