Jagged reflections when using ClearCoatBottomNormal

Hi all,
I’m learning UE 4.25 and am trying to get 2 different normal maps on a clear coat shader. I’m adding the ClearCoatBottomNormal as described here:…mal/index.html…mal/index.html

When I add the node, I get jagged reflections that seem caused by banding in the normal map. Is this expected behavior and how can I avoid it?
This happens regardless of what I plug in any of the normal slots (the usual and the ClearCoatBottomNormal).
Also, it’s not caused by the flatten normal node (see attachment), because it works fine when I disable the clearcoatbottomnormal.

Thanks in advance.