pgAdmin4 6.0+ http mixed content problem

Hi,

I'm experiencieng an http mixed content problem after update to 6.x.

When the list of databases is opened, browser accesses url
/http*s*://example.com/browser/tablespace/nodes/1/1/, the reponse is 308
with Location: http://example.com/browser/tablespace/nodes/1/1/

That leads to mixed content and browser blocks the xhr and the spinner
left to Databases node keeps spinning.

I'm using Apache reverse proxy to http://localhost:5050/ on
https://example.com/ domain.

Releases prior to 6.0 (e.g. 5.7) work fine.

Thanks.

Regards
Waclaw