I tried with an old 18.04.1 ISO and the same issue appeared, so it was
likely no regression after all just a fix that did not work 100% . I
must have misremembered it working properly...

** Changed in: sane-backends (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1863424

Title:
  Regression on Canon LiDE 120 by fix for #1731459

Status in sane-backends package in Ubuntu:
  Invalid

Bug description:
  sane-backends (1.0.27-1~experimental3ubuntu2.2) brought a fix for a black 
vertical band on scans
  done with e.g. Canon LiDE 100 and 200 scanners on Ubuntu 18.04 as noted here:

     sane-backends (1.0.27-1~experimental3ubuntu2.2) bionic;
  urgency=medium

       * debian/patches/git-fix-discolored-bar-issue.patch:
         - Upstream commit to fix issue with discolored bar on Genesys GL847
           scanners (LP: #1731459).

      -- Gunnar Hjalmarsson <gunna...@ubuntu.com>  Thu, 08 Aug 2019
  20:27:00 +0200

  However, on my Canon LiDE 120 it worked fine before that fix in 18.04, but 
now the image shows
  a discolored band at precisely the same location where on an LiDE 100/200 the 
black band
  used to be.

  See attached test scan for an example and compare with the uploads from
  https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1731459 .

  Affected are also daily builds of 20.04 from 2020-02-15.

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