Tue Mar 2 2021 20:16:05 UTC
It's not a bug, it's a feature.
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ID Product Comp Assignee Status Resolution Summary Changed
25123 Apache h mod_expi bugs CLOS DUPL 304 - Not Modified does not return Expires/Cache-Control headers 2004-11-16
One bug found.

as

File a new bug in the "mod_expires" component of the "Apache httpd-2" product