When an application is running, there is a small red dot next to the icon on the GNOME launcher sidebar (Ubuntu Dock). When two instances of the same application are running, there are two small red dots.
When I launch Slack to connect to my employer's workspace, the Slack application launches a Chrome page to authenticate my credentials. When that happens, I see two small red dots against the Slack icon. How do I get it to show me one red dot against Slack and one red dot against Chrome? I know it's possible because this is the behaviour on my other PC, which runs Fedora.
This happens because it's a chrome instance spawned from Slack and Gnome thinks it's another Slack window.
Does it do the same if Chrome is opened before Slack?
As a workaround, you could open Chrome first and cut/paste the address that Slack launches into the open Chrome window (a bit naff, I'll admit, but it technically solves your problem).