Old private tab data not deleting and randomly appearing

Brave Version 1.23.1 (
IPhone 11 Pro, iOS 14.2

When I go to thumbnail view when switching between public tabs, an open tab of a private window I had closed days before appears behind the tab thumbnails. It doesn’t even need to be the last private tab I closed, just a random long ago closed private tab. It is the actual live version of the page, as you can see in the screenshot below with the “thread archived” statement:

The same page appears if I use the pinch gesture to make the current public tab smaller:

If private mode doesn’t track history except for the trail of pages in the current tab, and all browsing data in private tabs is deleted when private mode
Is closed, how are old private tab contents randomly appearing long after they have been closed when I’m not even in private mode??

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