On-screen keyboard (OSK) no longer opens with touchscreens (Wayland + Xorg GNOME session) unless enabled in accessibility settings

[esjarc]

Since GNOME 3.35 packages made their way into the focal repositories, the on-screen keyboard no longer opens when touching on input fields or swiping upwards from the bottom edge of the screen. It does not matter if the Wayland or Xorg session is being used.
To use the on-screen keyboard, the user has to enable the on-screen keyboard in GNOME's accessibility settings first. Unfortunately this setting causes other issues, since the on-screen keyboard then also opens when the user selects input fields while using a keyboard and a mouse.
Everytime the user decides to switch input devices, the accessibility setting has to be toggled. This was not necessary in previous GNOME releases (3.34 and earlier) and shouldn't be necessary.

Even though the issue seems to be known already upstream (https://gitlab.gnome.org/GNOME/gnome-shell/issues/2378), it still harms the touchscreen experience of Ubuntu 20.04 quite significantly.

I am affected with three quite different devices, so this bug does not seem to be specific to a single hardware configuration.
HP ENVY x360 15-cp0
Lenovo ThinkPad L390 Yoga
Lenovo ThinkPad X201 Tablet

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.1-5ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: GNOME
Date: Tue Apr 21 09:05:18 2020
DisplayManager: gdm3
RelatedPackageVersions: mutter-common 3.36.1-3ubuntu3
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

I was wrong, sorry. Bug 1866556 is now reopened.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.