On Cosmic, running on physical hardware, I ~did~ experience the issue
with the app grid using gnome-shell 3.30.1-2ubuntu1. So I do not think
Cosmic is immune to this issue.

- - - - - - - - - - - - - - - - - - - -

However, I just tested the proposed gnome-shell version
3.30.1-2ubuntu1.18.10.1 in Cosmic.

With the proposed version...
1. The app grid works as expected
2. The favorites icons work as expected

- - - - - - - - - - - - - - - - - - - -

I did notice an odd behavior...
May be it warrants as separate bug report?
Nevertheless, I'll share it here in case others run into this as well.

1. Give a long press on a favorites icon.
2. The icon becomes opaque (as if it is ready to be moved on the dock).
3. The context menu (New Window, Preferences, Remove from Favorites, etc.) 
appears.
4. Select New Window.
5. A new window opens.

6. Then tap a different favorites icon.
7. Instead of opening the application, the context menu appears.
8. I am then unable to make a selection from the context menu.

9. Sometimes the icon gets moved from its position on the dock.
10. But it doesn't land back on the dock. Instead it is partially on the dock 
and partially on the desktop.
11. At this point, the desktop becomes unresponsive.

    Alt-F2 does not work.
    Mouse clicking does not work.
    Touch screen does not work.

    Ctrl-Alt-F1 ~does~ work, and you can use the GDM screen to reboot
the machine.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1745888

Title:
  Two instances of a program launch whenever you touch a favorites icon,
  or app grid won't show

Status in OEM Priority Project:
  Fix Released
Status in gnome-shell package in Ubuntu:
  Fix Released
Status in gnome-shell source package in Bionic:
  Fix Released

Bug description:
  [ Impact ]

  Using a touch screen, if you tap on a favorites icon on the ubuntu
  dock, two (or more) instances of an application launch.

  Also the app grid doesn't show after a quick tap on the apps icon

  [ Test case ]

  - Look for xterm in gnome-shell activities and add it to favourtes
  - With the ubuntu-dock showing in the desktop, touch the xterm icon
  - Only one instance if it should open
  - Tapping the app icons grid should properly open the g-s overview
  - Tapping on dock icons when in overview mode should work normally

  [ Regression potential ]

  Taps on other gnome-shell buttons could not work poperly (like some
  menu items or app grid)

  ProblemType: BugDistroRelease: Ubuntu 17.10
  Package: gnome-shell-extension-ubuntu-dock 0.7.1
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sun Jan 28 19:47:17 2018
  InstallationDate: Installed on 2018-01-28 (1 days ago)
  InstallationMedia: Ubuntu 17.10.0 2018.01.26 amd64 "Custom Artful Aardvark"
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bashSourcePackage: gnome-shell-extension-ubuntu-dock
  UpgradeStatus: No upgrade log present (probably fresh install)

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