If you have some saved windows and have the setting enabled to switch saved windows in-place, while using compact tabs, then the tabs become unusable.
Try switching to a group of saved windows, and when the tabs are populated, they overlay over any existing tabs, causing them to be unreadable, and extending behind the extensions and other controls on the toolbar. Additionally, the tabs themselves may not be able to be interacted with. Clicking on them does not switch, etc.
I expect the tabs to behave properly.
Version 0.99.127-beta (WebKit 619.1.1)
Sonoma (14)