Remove PMPro 3.7+ native avatar data filter.

my_remove_pmpro_avatar_filter.php

<?php
/**
 * Remove PMPro 3.7+ native avatar data filter.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_remove_pmpro_avatar_filter() {
	remove_filter( 'get_avatar_data', 'pmpro_get_avatar_data', 100 );
}
add_action( 'init', 'my_remove_pmpro_avatar_filter' );