I just released opera-beta 66.0.3515.8 to its edge channel and installed it to my machine. I don’t think gnome-3-28-1804 is connected and the browser crashes with the issue I posted in Opera stops working after upgrade due to gnome connection issue.
$ snap connections opera-beta
Interface Plug Slot Notes
audio-playback opera-beta:audio-playback :audio-playback -
avahi-observe opera-beta:avahi-observe - -
browser-support opera-beta:browser-sandbox :browser-support -
camera opera-beta:camera - -
content[chromium-ffmpeg-93464] opera-beta:chromium-ffmpeg-93464 chromium-ffmpeg:chromium-ffmpeg-93464 -
content opera-beta:gnome-3-28-1804 - -
content opera-beta:gtk-3-themes - -
content opera-beta:icon-themes - -
content opera-beta:sound-themes - -
cups-control opera-beta:cups-control - -
dbus - opera-beta:dbus-daemon -
desktop opera-beta:desktop :desktop -
desktop-legacy opera-beta:desktop-legacy :desktop-legacy -
gsettings opera-beta:gsettings :gsettings -
home opera-beta:home :home -
mount-observe opera-beta:mount-observe - -
network opera-beta:network :network -
network-control opera-beta:network-control - -
network-manager opera-beta:network-manager - -
opengl opera-beta:opengl :opengl -
password-manager-service opera-beta:password-manager-service - -
process-control opera-beta:process-control - -
pulseaudio opera-beta:pulseaudio :pulseaudio -
screen-inhibit-control opera-beta:screen-inhibit-control :screen-inhibit-control -
unity7 opera-beta:unity7 :unity7 -
upower-observe opera-beta:upower-observe :upower-observe -
wayland opera-beta:wayland :wayland -
x11 opera-beta:x11 :x11 -
sudo snap connect opera-beta:gnome-3-28-1804 gnome-3-28-1804 solves the crash for me.