Plone 6.0.2

When a number of documents have a keyword in their Subjects field, the document view shows a link to the search page to find similar content items with the same keyword:

http://localhost:9350/plone/@@search?Subject%3Alist=FAQFolder

However, when that search result contains more than 1 page, the batching menu breaks the search criteria: Subject is dropped and instead all items in the site are shown, with a full select on all portal_types:

http://localhost:9350/plone/@@search?sort_on=&sort_order=&b_start%3Aint=10&advanced_search=False&SearchableText=&created.range%3Arecord=min&pt_toggle=%23&portal_type%3Alist=Document&portal_type%3Alist=Term&portal_type%3Alist=Collection&portal_type%3Alist=Glossary&portal_type%3Alist=Folder&created.query%3Arecord%3Adate=1970-01-02T00%3A00%3A00