Sun Jan 19 2020 09:46:09 UTC
It's not a bug, it's a feature.
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ID Product Comp Assignee Status Resolution Summary Changed
21907 Apache h mod_expi bugs RESO DUPL suggest that one can set ExpiresByType while other files do not set expires header 2005-06-22
24459 Apache h mod_expi bugs CLOS DUPL Mod Expires generates internal error 2004-11-16
2 bugs found.

as

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