I am a maintainer of optax package in Archlinux User Repository (AUR). Me and some other users noticed that suddenly hashes of tarball for v0.2.0 have been changed. It seems that the tag has been moved to another commit. This breaks package installation and system updates for some users due to failed checksum verification. This problem is even more subtle since pacman (Archlinux package manager) caches tarballs by name.