Product Page does not work with many variants

Hello, I have a product with many variations. When I add them, WooCommerce gives out impossible combinations.

So far I have been able to solve this with a few (100-200) variants with the following code and the corresponding number of variants in it:

function custom_wc_ajax_variation_threshold( $qty, $product ) {

 return 700;

}

add_filter( 'woocommerce_ajax_variation_threshold', 'custom_wc_ajax_variation_threshold', 100, 2 );

Now I have a product with more than 650 variants and after increasing the number in the code above, the first step can be selected in the MSPC (a plugin wich makes steps into variations), but I cannot jump to the next step (neither manually, nor automatically).

Now i have found the problem. If i disable the WooCommerce Page Builder it works, but it doesn’t look good. But if i have it activated i have the same problem.

I think it’s a problem between the WooCommerce Page Builder and MSPC. Maybe you can see something on my page?

Here is a link to the product page: https://new.handysalon.com/product/reparatur-buchen/

Thanks a lot!

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