Attribute bug when used as variations in Woocommerce 5.5.5

It’d be great if anyone can help me fix this problem in Woocommerce 5.5.5

If an attribute contains an uppercase letter, a word space, or any symbol character, when used for product variations the dropdown on the product listing page just says “choose an option” and won’t let the user see or select options.

Product 1 (test1 | test2 | test3): https://hopscotchlondon.com/product/test-variable-product-2/

Product 2 (test 1 | test 2 | test 3): https://hopscotchlondon.com/product/test-variable-product-2/

It’d be great to find a workaround for this, as it’s really tricky naming variations and avoiding the characters that don’t work!

Thanks in advance for your help!