GDAL 2.4.4 doesn't create zips so it must be MapServer doing the zipping in this version at least?
Direct support for zipped shape is a recent GDAL 3 addition, which MapServer doesn't use. MapServer uses instead a lower level GDAL's CPL ZIP API: https://github.com/MapServer/MapServer/blob/main/mapogroutput.cpp#L1304
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