Entries Labeled "1Password 6"

I’ve been using 1Password for many years over several versions. I’m now fully up to date. When I show all items (on MacOS), the list includes roughly 130 mysterious entries, all labeled “1Password 6” and all containing nothing but a password and a link to this url: app://com.agilebits.onepassword4.

Anybody know what these items are? And whether I can delete them?

Thanks very much --