Slicer download page points to an older nightly package for Mac.
The package downloaded directly from CDash corresponds to the latest revision.
It looks good now. It takes some time for a new package to show up on the download page + today Mac package was created 3 hours later than other platforms => what you saw was a transient that was resolved by itself, most probably normal behavior.
Makes sense, thanks! I didn’t realize the extent of the delay.