Fool me once, maybe a coincidence, but twice? I don't think so.
Preface:
HEIC/HEIF (HEVC) is proprietary format of MS and APPL. AVIF (from AV1) is libre software from Alliance of Open Media (AOM).
What happened:
For the second time this year, KDE devs (MS employees that sabbotage KDE ?) removed AVIF support in KDE. But NEVER REOMOVED OR TOUCHED PROPRIETARY HEIC/HEIF (HEVC).
Something is going on. Once? Maybe a coincidence, a bug? But for the second time? No! Someone went into kimageformats and removed "avif.so" from this library. It had to be done on purpose. Especially when you consider that HEIC/HEIF has never been removed.
Fixed by the same version fo the library. Apparently Arch fixed if by updating from "-1" to "-2". Same library different compilation (from dash one to dash two).