I have to move my cursor almost all the way to the center of an icon for a pinned tab to click it. In areas near the edge, it will not switch to the tab. (You can see many of my clicks in the recording, as in Raindrop they cause the selection to be briefly de-selected. But throughout the video I am clicking on the pinned tabs' icons to try to switch them.
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I think the entire area of a tab within its displayed border should be clickable to switch to that tab.
Version 1.0.2 (141), WebKit 624.1.2.19.2
Tahoe (26)