Reply To: Filter Attributes – Don't Show Out of Stock Variations

No the problem is related to this

https://github.com/woocommerce/woocommerce/issues/20800

https://github.com/woocommerce/woocommerce/issues/20689

I guess not even an official woocommerce fix is available except maybe you develop this function to check against out of stock variations and don’t show them.

Thank you.