Exactly,
I have just removed this preference and the preview now work right.

In T289169#7294619, @valerio.bozzolan wrote:

I think it's still a cat, but a pretty pissed off one.

But, let me understand: fabula is the Schrödinger's server?

In T283170#7099163, @Zabe wrote:

@Galessandroni The error hasn't been fixed, we just went back to the old version.

Exactly, now all works well.

#iosperiamochemelacavo
(only for Italian people, sorry)

In T277008#6905929, @Nemo_bis wrote:

If I understand https://www.ovh.com/fr/images/sbg/index-en.html correctly, we'll know more about the location(s) of the snapshots in the coming 24-48 hours.

Dear Valerio,

Not only this logo is 100% adorable, but - and I hope this is not only an idea of mine - this survey tool can be adopted by Wikimedia Foundation.