Fedora 38 ships Amavis 2.13.0 which switched to clamdscan in Amavis upstream.We have a winner... Did the package manager explain/release_note why they made that move?
The config file change [1] comes with an explanation. The Fedora setup does not fit the explanation completely, because it runs a dedicated clamd instance with amavis uid. Shouldn't be necessary with fdpass, but well.
[1] https://gitlab.com/amavis/amavis/merge_requests/38/diffs