This is different to the old bug.  Prior to the recent change to xdg-
email, simple scan "send by email" was working fine.

I think that the problem is because xdg-email assembles command line
arguments such as -attach to form a mailto: URL and passes that to
run_thunderbird, which recently got changed to drop the attachment field
from the mailto: url (I think on the assumption that the mailto: url
could only come from a browser click).

The proper fix would probably be to break any command line mailto: URL
down into component parts and drop any "attach" argument before
reassembling as today, and reinstate the code removed in the recent
change.

In the above simple-scan bug report I added a patch which just
reinstated the original code but only if the caller is not
Chrome/Chromium as those are the only browsers in question in my
environment (Firefox appears to call Thunderbird directly).

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https://bugs.launchpad.net/bugs/1909941

Title:
  xdg-email changes break simple-scan email functionality

Status in xdg-utils package in Ubuntu:
  New

Bug description:
  Observed on 16.04 to 20.04
  xdg-email no longer actions "-attach filename" arguments when running 
thunderbird following recent security fixes to protect against malicious use 
from browser ( https://security-tracker.debian.org/tracker/CVE-2020-27748 and 
https://ubuntu.com/security/CVE-2020-27748 )

  This breaks simple-scan "send by email" functionality and other
  applications too.

  https://gitlab.gnome.org/GNOME/simple-scan/-/issues/216
  https://forums.linuxmint.com/viewtopic.php?f=208&t=336053
  https://gitlab.freedesktop.org/xdg/xdg-utils/-/merge_requests/28 (see 
comments)

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