Issue with AJAX function of mini cart

With the latest version 1.2.12 a new issue is there. I can add a product into cart but it won’t be there. Just after reloading the page I can see the into cart added product in the cart. Going back to 1.2.11 and everything is working again fine.

Don’t know what has been changed – because there is no changelog – but it is affecting the cart of WooCommerce. Please check this and do an update. Until then I have to work with 1.2.11 to have to problems.