This breaks the WooCommerce settings pages, not just by using a separate plugin.
In “class_googlepay.php” the function payment_method_type() have to change the empty check, since $method_type can be empty.
On line 117 I added && !empty( $method_type )
if ( empty( $google_method ) && !empty( $method_type ) ) {
set_transient( PREFIX . '_google_method', $method_type, \HOUR_IN_SECONDS );
$google_method = 'googlepay';
}