Trouble with WP 4.5

I am not sure exactly what’s causing trouble for me but thought I’d give it a try here. I am running a multisite install of WP 4.5 with BTF 1.2.9.

After I updated WordPress to 4.5, BTF is not able to work its magic anymore (I am 100% sure that it did before the update). For example at maqs[dot]com/en/co-workers/office/malmo/ . Neither the select box or the which co-workers are listed is affected by the “office/malmo” part of the URL. If I try dumping get_query_var('office'), i get an empty string.

$wp_rewrite does include ["co-workers/(position|area-of-expertise|office)/(.+?)/?$"] => "index.php?post_type=co-worker&$matches[1]=$matches[2]".

If I add this

add_filter('query_vars', function($public_query_vars) {
$public_query_vars[] = 'office'
});

, “Malm?” gets selected in the select box but the filtering still does not work.

I have saved the settings for BTF and also clicked “save” on the permalinks settings page and site settings page.

I have tried googling for rewrite errors in 4.5 an found another user that had some trouble with another plugin. The solution there was to disable all plugins and then re-enable them. I tried that without any success.

Any thoughts or help would be greatly appreciated.

https://www.ads-software.com/plugins/beautiful-taxonomy-filters/