The inline lookups (the ones that open the table on the same page, under the textbox) have an "aria-expanded" attribute that behaves different on card pages vs tables.

On card pages that attribute gets stuck on true after opening the lookup the first time. I would expect this attribute to return to 'false' once the lookup table is no longer visible (this is the behavior on tables).

This is not really an idea, so please point me in the right direction if I should report this somewhere else.