Why modal basket window don't shows up?

Hi everyone!
I have small issue… I was created “clean” template (override from flow, without any changes yet). When i add something to basket modal window don’t shows up. When i change to flow template modal windows shos up correct. Has anybody had the same problem?

are there any errors in browser console?

there is no any browser console error. But product was added to the basket

please describe a bit more detailed how you copied flow and what changes did you make.

Hmmmm… i was copy build folder and genereate all files with grunt. There is no any tpl files overrided. OXID 6.0.0 EE. Anything else?

This can not work.
Build folder contains only css and js files, but you need at least theme.php to make your child theme available.