WooCommerce Dropdown Product Quantity (not compatible with Mix and Match, Product Bundles, etc)

functions.php

<?php
/**
 * Change the quantity input to select.
 *
 * @param  array           $args Args for the input.
 * @param  WC_Product|null $product Product.
 * @param  boolean         $echo Whether to return or echo|string.
 *
 * @return string
 */
function woocommerce_quantity_input( $args = array(), $product = null, $echo = true ) {
	if ( is_null( $product ) ) {
		$product = $GLOBALS['product'];
	}

	$defaults = array(
		'input_id'     => uniqid( 'quantity_' ),
		'input_name'   => 'quantity',
		'input_value'  => '1',
		'classes'      => apply_filters( 'woocommerce_quantity_input_classes', array( 'input-dropdown', 'qty' ), $product ),
		'max_value'    => apply_filters( 'woocommerce_quantity_input_max', -1, $product ),
		'min_value'    => apply_filters( 'woocommerce_quantity_input_min', 0, $product ),
		'step'         => apply_filters( 'woocommerce_quantity_input_step', 1, $product ),
		'pattern'      => apply_filters( 'woocommerce_quantity_input_pattern', has_filter( 'woocommerce_stock_amount', 'intval' ) ? '[0-9]*' : '' ),
		'inputmode'    => apply_filters( 'woocommerce_quantity_input_inputmode', has_filter( 'woocommerce_stock_amount', 'intval' ) ? 'numeric' : '' ),
		'product_name' => $product ? $product->get_title() : '',
	);

	$args = apply_filters( 'woocommerce_quantity_input_args', wp_parse_args( $args, $defaults ), $product );

	// Apply sanity to min/max args - min cannot be lower than 0.
	$args['min_value'] = max( $args['min_value'], 0 );
	$args['max_value'] = 0 < $args['max_value'] ? $args['max_value'] : 10;

	// Max cannot be lower than min if defined.
	if ( '' !== $args['max_value'] && $args['max_value'] < $args['min_value'] ) {
		$args['max_value'] = $args['min_value'];
	}

	ob_start();

	if ( $args['max_value'] && $args['min_value'] === $args['max_value'] ) {
		
		echo '<div class="quantity hidden">
			<input type="hidden" id="'. esc_attr( $args['input_id'] ) .'" class="qty" name="'. esc_attr( $args['input_name'] ) .'" value="'. esc_attr( $min_value ) .'" />
		</div>';
	
	} else {
		/* translators: %s: Quantity. */
		$label = ! empty( $args['product_name'] ) ? sprintf( esc_html__( '%s quantity', 'woocommerce' ), wp_strip_all_tags( $args['product_name'] ) ) : esc_html__( 'Quantity', 'woocommerce' );
		
		echo '<div class="quantity">'; 

		do_action( 'woocommerce_before_quantity_input_field' );
			
		echo '<label class="screen-reader-text" for="'. esc_attr( $args['input_id'] ) .'">'. esc_attr( $label ) .'</label>';
		
		$options = '';
		for ( $count = $args['min_value']; $count <= $args['max_value']; $count = $count + $args['step'] ) {
			$options .= '<option value="' . $count . '" '. selected( $args['input_value'], $count, false ) . '>' . $count . '</option>';
		}
		echo '<div class="quantity_select"><select name="' . esc_attr( $args['input_name'] ) . '" title="' . _x( 'Qty', 'Product quantity input tooltip', 'woocommerce' ) . '" class="qty">' . $options . '</select></div>';

		do_action( 'woocommerce_after_quantity_input_field' );
		
		echo '</div>';
		
	}

	if ( $echo ) {
		echo ob_get_clean(); // WPCS: XSS ok.
	} else {
		return ob_get_clean();
	}
}

Hi @Allshookup4 I am glad you like the code snippet. i just dropped it into my site (it's been ages since i looked at it) and I cannot reproduce what you are describing. Line 42 should be true if the product is "sold individually" as the min quantity will be equal to the max quantity... ie: 1. I would check if you have any other themes/plugins/snippets impacting the max quantity.