Without root access (or being worried of an update overwriting the
changes), this is how I could fix it as a user.

I've placed this in my ~/.config/gtk-3.0/gtk.css file:

  window.desktopwindow.background:backdrop {
    box-shadow: none;
  }

Don't ask why it's gtk-3.0 and not 3.20 or 4.0, I have no clue.

The "window.desktopwindow" selector is something I've found in gnome-
shell-extension-desktop-icons-ng's source. It's a more specific selector
than the one in the theme, hence takes precedence over that. Without
this selector they would be of the same precedence, and for some reason
the one in the theme is used, the one in the user's config is ignored.
And GTK doesn't seem to support "!important".

This extra selector luckily gives some confidence that the rule probably
doesn't have an effect on others. (However, the disclaimer from my
previous comment still applies.)

In extension-manager toggle the said extension back and forth to apply
the change.

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https://bugs.launchpad.net/bugs/1986450

Title:
  Visual artifact 1px vertical white line right side of the wallpaper

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