Error with faceted search

[NeoTrafy]

Hello, I'm new to the forum and tried to create the topic on the right subforum. 

I have a problem with faceted search. I see the title but the options are not there. I did a clean installation, without the theme I'm using, with no more modules than the official ones and it's happening the same thing. With the PS version 1.7.5.2 and faceted 2.2.0 everything was working fine. 

Here are the specs:
PS 1.7.6.3
Faceted 3.4.1
PHP 7.2.24

Any idea what else should I check? Or this is a common error and it's going to be solved "soon"?

Thank you in advance to everyone.