Comment 4 for bug 1791791

It seems to me that it is the query part of the URL (e.g., "query=mentální postižení valenta;") that prevents the previews from showing up.

When I search for mentální postižení valenta in our catalog, one of the results is the record Eva has mentioned:

https://spok.jabok.cuni.cz/eg/opac/record/30492?query=ment%C3%A1ln%C3%AD%20posti%C5%BEen%C3%AD%20valenta;qtype=keyword;locg=1;detail_record_view=0

When the URL is manually changed to:

https://spok.jabok.cuni.cz/eg/opac/record/30492?qtype=keyword;locg=1;detail_record_view=0

(meaning that "query=mentální postižení valenta;" is omitted),

the preview does show up.

Could that help in determining the underlying cause of the problem?