Load view with ajax and contextual/exposed filters
If you call a display_id of block_1 the block does not have the exposed_form created to be evaluated by default in Views (views blocks cant have exposed forms out of the box) -- so your AJAX views calls knows nothing about any exposed form.

You need to either call a Views Page url where the exposed form is set on the page. Or, you need to use Views hooks to create/attach the exposed form to the View when your Ajax call is made.