I use the Opera browser without tabs; i.e. browser windows open separately, and Notion does the tabbing. In the latest Notion, opening a new opera window works, but also sets the urgency hint to another opera window that is currently open in another workspace. To be clear, the other window shouldn't be involved at all. Everything is correct, except the bogus urgency hint; nothing should be urgent in this situation. In ion3, this all worked just fine.
I ran a bisect, and the issue first appeared in commit 35951ebac0f78fa8cad16bb23f0c4f49ae486453
Immediately before that commit the bogus urgency hint isn't there, but for some reason Notion switches to the workspace containing the other Opera window first, before creating a new one. This is wrong as well, but different.