Fedora's virt-manager started using external snapshots for me as of Fedora 41
Fedora's virt-manager has started defaulting to external snapshots as of Fedora 41, which cannot be reverted when mixed with internal snapshots. Users discovered this when trying to revert or delete snapshots, encountering errors about external snapshots not being revertable. The issue is particularly problematic when external snapshots are created on top of existing internal snapshots.