Safari tab persists in iCloud Tabs on Mac despite not being open on iPhone

There is a Safari tab that is not opened anymore in my iPhone, but it still appears in the section "iCloud Tabs" on Mac, as it was open on iPhone. When I close it on Mac it disappears temporarily, but reappears when I use Safari on the iPhone again. No sign of this tab open on iPhone. I have tried already deactivating and reactivating Safari on iCloud on both devices, but did not work. Even after iOS updates it remained.