Pinned tabs malfunction in Safari

I've been using Safari with three pinned tabs. Every since the update to Monterey 12.2 beta things have been malfunctioning: If I switch to another tab and try to go back to my pinned tab, there's no url (or page) there any more. If I fill the URL in again, this causes Safari to crash (illegal store). I thought that it might be fixed in 12.3.1 beta but it's still there. In addition (and I don't know if this is related), if I terminate Safari (for example if I have to shut down or reboot), when it comes up again all of the tabs that I had open are lost -- they are all replaced by a reference to google.com (which is my default home page). Has anyone else seen this happen?

Pinned tabs malfunction in Safari
 
 
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