Hi!
I am having the same problem, and creating a new attribute isn’t an option for me as I am importing products, where I cannot define attribute slug.
So the problem is when I use the original slug, the button display does not work. If I change the slug to anything different, it works. Unfortunately it is not a good solution, because if I import new products, a new attribute is created with the original slug, causing the same problem. I already tried clearing cache, but did not solve the issue.
Could you please have a look at my site, why button display does not work?
Example product url: https://thewardrobe.hu/uzlet/szoknya/plisszirozott-szoknya/
(the attribute in question is called ‘Méret’)
Please also let me know if you need admin login details.
Thanks