Google crawling Weltpixel pages with /wpproductlabels/...

I've noticed in Google Search Console that Google has begun crawling pages on my website with /wpproductlabels/...

An example on the Pearl demo website would be:
https://pearl.weltpixel.com/wpproductlabels/product/labels/product_id/1098/

Is there any way to prevent this from happening?

I have added the following to my robots.txt file:
Disallow: /wpproductlabels/

Any advice would be appreciated.