product:permalink from a hook doesn’t paginate

Have discovered that the “plugged in” {+product:permalink+} and {+product:post_title+} obstruct the pagination shortcode if injected from a hook, i.e:

this works:

[mla_gallery attachment_category=prints-a3 posts_per_page=4 mla_rollover_text="[+product:post_title+]" mla_link_href="{+product:permalink+}"]
[mla_gallery attachment_category=prints-a3 posts_per_page=4 mla_output="paginate_links,prev_next"]

but a hook like this doesn’t:

add_filter( 'mla_gallery_attributes', 'ew_gallery_attributes', 10, 1 );
function ew_gallery_attributes( $attr ) {
if ( !isset( attr['mla_output'] ) ) {
$attr['mla_rollover_text'] = "{+product:post_title+}";
$attr['mla_link_href'] = "{+product:permalink+}";
}
return $attr;
}

as it only works on the 1st page, but messing the expanded pagination, like this:

<a class="page-numbers" title="[+product:post_title+]" href="[+product:permalink+]?mla_paginate_current=2" tabindex="-1">2</a>

The behavior is the same with the mla_gallery_raw_attributes hook.

Bumped into this, as was looking to get boilerplate params consolidated into a hook, to simplify markup across pages and allow tweaking multiple MLA galleries on-the-fly.