karmaral

I have used it with ‘above-compatible’ versions but not with the latest latest.
The solution I found was to push filters last, since it seems it was being formatted before Woocommerce finished doing its stuff.

This is inside includes/class-wcqu-filters.php:

class WC_Quantities_and_Units_Filters {
		
	public function __construct() {
		
		// Bumped priority to 100 to fix issues

		// Cart input box variable filters
		add_filter( 'woocommerce_quantity_input_min', array( $this, 'input_min_value' ), 100, 2);
		add_filter( 'woocommerce_quantity_input_max', array( $this, 'input_max_value' ), 100, 2);
		add_filter( 'woocommerce_quantity_input_step', array( $this, 'input_step_value' ), 100, 2);
		
		// Product input box argument filter
		add_filter( 'woocommerce_quantity_input_args', array( $this, 'input_set_all_values' ), 100, 2 );

		add_filter( 'woocommerce_loop_add_to_cart_args', array( $this, 'woocommerce_loop_add_to_cart_args' ), 100, 2 );
	}

This worked for me, but of course, make a backup before trying.