Post title overwritten on update

[Robert Jones]

I'm using the following code to update a post via a gravity form:

<?php $id = get_the_id();
echo do_shortcode('[gravityform id="4" title="false" description="false" update="'.$id.'"]'); ?>

On updating the form my ACF fields are updated but the standard WordPress title gets changed to "Update_2", if I update again it just changes to "Update_3" and so on.

The CPT post already had a title, as soon as I updated it just changes to the above.

All plugins and core are running the latest as of this point.

[Robert Jones]

I've solved this but seems there's a bug in the plugin. I've just added on a hook to override the title after submission. It doesn't solve the initial problem, it just corrects it after.

add_action( 'gform_after_submission_4', 'set_post_content', 10, 2 );
function set_post_content( $entry, $form ) {

    //getting post
    $post = get_post( $entry['post_id'] );    
    $post->post_title = rgar( $entry, '8' ) . ' ' .rgar( $entry, '9' );

    //updating post
    wp_update_post( $post );
}