I can "fix" the issue if I add the following two lines to
/etc/apparmor.d/abstractions/ubuntu-browsers and reload the evince
profile:

  /usr/bin/env rmix,
  /usr/bin/snap Cx -> sanitized_helper,

Probably not acceptable as is because this would allow executing any
snap, not just chromium. And snaps are not guaranteed to be strictly
confined (e.g. classic/devmode).

But a rule on /snap/bin/chromium is not good enough as
/snap/bin/chromium is a symlink to /usr/bin/snap.

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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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