Composite / VrayCompTex Issue

Trying Vantage for the first time via 3DS Max and have noticed that my materials with two bump maps combined via a composite or vraycomptex mode only seem to display the bump connected to the first source. The supported features page (Chaos Vantage) shows both as supported so not sure what I’m doing wrong. Any tips appreciated!

For bump mapping, only bitmap textures are supported.

Greetings,
Vladimir Nedev