When a tab loads behind the visible tab and then I switch to it, the top part of the Orion window (incluidng navigation buttons, URL bar, bookmarks bar, etc) is completely transparent. The functions in that part of the window do appear to operate correctly, but are very difficult to read due to the page content showing up behind them. Reloading the page corrects the issue.
I expect the window to render the same whether it is for the visible/frontmost tab or behind the one that is visible.
Orion 0.99.137-beta, MacOS 26.0.1 (Build 25A362)
Tahoe (26)