All additional Panels vanished

Hi,

for my main admin user, the YOAST SEO, Page options and Laguages bottom panels have gone. There is just a grey strip showing now.
When I log in with a second admin, these panels show.

I wittnessed them vanishing. I clicked the down arrow on the panel’s header to many times, I guess, and now they are gone. And there is no way to get them to show again. This seems to be a bug.

Here are some screeshots.

Bottom panels not showing:
Bottom Panels not showing

The relevant Panels are switched on:
Pages Prefs Panel settings

Panels that should show (other admin user):
Panels showing with other user

How would I fix this?

Thanks!

cmyck