After losing internet connectivity and connecting via a mobile hotspot I experienced various issues involving no URL in address bar, tabs not switching, transparent address bar and greyed out tabs.
This issue occured after following steps I have taken today:
- Lost connectivity
- Disconnected from wifi
- Opened another application
- Connected to mobile hotspot (iOS)
- Went to tab bar (all items greyed out)
- Clicked add new tab button

The expected result is a functional address that shows the correct URL, isn't transparent and the Add Tab button working as expected.
Version 0.99.135.2-rc (WebKit 622.1.15.19.2)
Sequoia (15)