That seems entirely possible, some sort of parsing bug/change makes sense.
The =| action is a bit arcane (even for procmail) so I can definitely see
it getting overlooked.
It does appear in man procmailex as the "alternate method":
To extract certain headers from a mail and put them into environment
variables you can use any of the following constructs:
SUBJECT=`formail -xSubject:` # regular field
FROM=`formail -rt -xTo:` # special case
:0 h # alternate method
KEYWORDS=| formail -xKeywords:
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https://bugs.launchpad.net/bugs/2096676
Title:
procmail =| action assignment not working
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