Filter by post type

I’m trying to use the new filters to filter the results by post type. I’ve created a very basic query, just querying for post type Pages, Posts and Products.
If I then create a checkbox filter targeting that query with source Wordpress field and field Post type I get checkboxes for ALL post types in the builder. In the frontend I only see checkboxes for the three relevant post types. But when I check the checkboxes, nothing seems to happen, except if I click both Posts And Pages, then it filters the results in some way. The query_results_count never updates either. I have tried with disable query merge both on and off.

Is it not possible to filter on post type? Or am I doing something wrong or is it a bug?