Steve, the snap_browsers abstractions needed an update because the
abstraction had not been updated in an year and the snap browsers now
required read and lock permissions to the file
/var/lib/snapd/inhibit/{browser-name}.lock, but this was also submitted,
approved and merged upstream:
https://gitlab.com/apparmor/apparmor/-/merge_requests/1045

Regarding the patch for evince, I kept the "Recommends" because, yes, the 
include if exists checks if the abstraction is present and it only includes in 
the case it is, but the actual rule which references the snap_browsers profile 
could fail for apparmor versions for which snap_browsers does not exist.
/{,snap/core/[0-9]*/,snap/snapd/[0-9]*/}usr/bin/snap mrCx -> snap_browsers,

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https://bugs.launchpad.net/bugs/1794064

Title:
  Clicking a hyperlink in a PDF fails to open it if the default browser
  is a snap

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