Infinitehits show-previous: when clicking "Show previous results", page=x query param does not update to previous page

We are using the infinitehits widget, and have enabled the “show-previous” modifier to enable the “page=x” query parameter, which allows us to load directly to a page in the results.

However when clicking the “Load previous results” button, the page query parameter does not update to the previous page. This disagrees with click the “Load more results” button, which updates the page query parameter to the next page.

i.e. say we are on /collections/mycollection?page=4 and we click “load previous results”, we want the url to change to /collections/mycollection?page=3.

Thanks in advance!