Problem embeding posts after upgrading to 4.5.2

Hi all,

I have a very strange problem with embeding wordpress posts in a post after upgrading from 4.4.3 to 4.5.2.

Embeding my own posts results as a quoted text in a post. But, after reloading the page few times, everything turns all right.

Problem can be seen in Chrome, IE, mobile…

You can see the problem here:
http://www.gradnja.rs/pogledajte-zasto-su-velux-standard-plus-krovni-prozori-pravi-izbor-za-vas/

Does anyone know what’s the problem?

Best,
Igor