I use slide from left edge to reveal tabs (this would ordinarily be used to go forward in the history of that tab).
Quite often, it shows up as an empty space. It’s not even the tab container because it’s missing the search tabs input box and the usual buttons that show up at the bottom. It’s just a complete blank space top to bottom. I’m using iOS 26.4 but it was also an issue on iOS 26.3. I’ve taken a screenshot. That black space on the right is what happens. 
Tab bar to show up with open tabs
1.4.13
26
