I got caught by this one today. I use the search feature all the time, and I don't know why I didn't notice that until today. I found the thing I was looking for, then wanted to go back to issues backlog for that repo, I clicked "Issues", that just took me to a filtered view of my search term within issues. Deleting my search term didn't help. I was clicking around for at least a minute before I realised there's actually no way back to the main repo from that page.