Has Ubuntu dock/Dash to dock stopped working in 19.04 with Gnome shell 3.31.92? Maybe it is a temporary matter, until the extension is updated.
Good to know it is just a bug.
In that link you gave (bug), it tells that, if one for some reason, installs D2D, the whole stuff breaks. It also opens a thought; what might happen, if micheleg suddenly stops developing this extension.
Your are using a development daily iso. That’s what those Isos are for, find issues and report them. Not to be fancy on the bleeding edge.
That’s what I always do. More than a decade. Not worried much about breakages. Have few 'buntus derivatives (somewhat tweaked) and one O’buntu.
Went through whole lot of bug reports. There’s only 2 on D2D/Ubuntu dock on 19.04. None solved. For, it’d get resolved, when micheleg updates it.
Do you use 19.04 on daily basis? I do. 5 different ones. And, they are the only 'buntus I have.
Upgrade yours to gnome shell 3.31.92 and check.
I have removed the Ubuntu dock extension then rebooted the pc and it is working again.
(sudo apt remove gnome-shell-extension-ubuntu-dock)