Substance Designer: Normal Map Issue

goekbenjamin

When adding/removing a "default plain normal map"  into the normal slot, you can clearly see that the preview changes somehow

https://images-ext-2.discordapp.net/external/dyW61KpBMqehHwATbxl8ZCFDcxPyuNaUygUZtv7_NhY/https/i.gyazo.com/541f505c5bdec167dfa94c012f2dc579.mp4

its like the default normal map has still some values in it...is that a bug?
(i choosed "metalic roughness", version: 2018.3.1)

poopipe

if the map is not connected the output has an invalid value (black probably)  

goekbenjamin

oh great that makes sense! thanks alot!