Customizer issues with 4.2.0

Hi @evgenyviner.
As mentioned, here:
https://www.ads-software.com/support/topic/problem-with-typography-headers/
and here:
https://www.ads-software.com/support/topic/heading-font-size/
the problem still exists in new update 4.2.0. so need css to work. Any change in headings h1-h6 does not apply.
If it helps, i have screenshot of the behaviour with browser console:
https://drive.google.com/open?id=1uRBTbgNh6RPPBKwhJeq7xGQTeR93Kv7c

One more issue in customizer (confirmed also by @abigailm), but the topic was deleted. The fa-icons in content boxes do not appear in customizer only and are all set to fa-glass.
https://drive.google.com/open?id=1w4zVCegc_yLV4Cs8aCBzj7vVDkopSqj3
In front everything looks great.

Thank u for your time!