Tabs shown in tab overview aren't visually closed

If I click the close button in the miniature view, the tabs aren't visually closed. If I reopen the miniature view they're gone.

Tabs show go away visually.

Orion 0.99.127.3-beta, Sonoma 14.4.1

Sonoma (14)

Works just fine for me. Version 0.99.127.3-rc (WebKit 619.1.1)