Product Page “Floating Bar” shows “show options” even if option is chosen

I believe this is a bug. Product Page Floating Bar shows “show options” rather then “buy now” even if variation is already chosen.

How to reproduce: Add Variable Product to store, add variation attribute and configure it’s price etc. Set attribute as “used for variations” for one of variations. Go to the Product listing, scroll down. You will see Page Floating Bar shows with “show options” button.