The issue is fixed in ImageMagick 6.9.12-68 with commit cc4e5a63, and possibly with some other HEIC related commits from the 6.9.12 branch.
Please consider adding 6.9.12 to backports, or applying HEIC coder changes from 6.9.12 to 6.9.11. https://github.com/ImageMagick/ImageMagick6/commit/cc4e5a6383961c03d340e0237feedfff83f9af0b -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1980124 Title: Creating AVIF or HEIC images with transparency does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/1980124/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
