As the title says, vertical tabs are usually not highlighted for me in the last ~week or 2. clicking around can cause it to work again. AFAICT it tends to occur after clicking the New Tab button in the vertical tab list. occasionally the New Tab button itself will retain a lingering highlight after click or even hover.
it's surprisingly disorienting! i never realized how much i rely on the active tab being highlighted.
normal behavior is that the active tab is highlighted in the vertical tab bar
Version 0.99.134-beta (WebKit 622.1.9.19.2) | MacBook Pro (macOS Sequoia 15.5 build 24F74)
Sequoia (15)