Missing thumbnail images on Safari's Tab Overview featuture

Hello dumbo3420,

It seems like you are missing ways to preview Safari tabs on the iPhone. Since noticing this behavior, have you try to close out all tabs and start them up again?

Use tabs in Safari on iPhone - Apple Support

Close all your tabs

On any open page, touch and hold , then tap Close All Tabs.

You can also close your tabs from the Tab Overview screen. Touch and hold Done, then tap Close All Tabs.

You may also want to try to clear the history and cache from your Safari browser:

Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch - Apple Support

Delete history, cache, and cookies

- To clear your history and cookies, go to Settings > Safari, and tap Clear History and Website Data. Clearing your history, cookies, and browsing data from Safari won't change your AutoFill information.

- To clear your cookies and keep your history, go to Settings > Safari > Advanced > Website Data, then tap Remove All Website Data.

- To visit sites without leaving a history, turn Private Browsing on.

When there's no history or website data to clear, the setting turns gray. The setting might also be gray if you have web content restrictions set up under Content & Privacy Restrictions in Screen Time.

Regards.