Composite Textures Normal to Roughness Alpha doesn't generate valid data

More infos on https://udn.unrealengine.com/questions/428429/composite-textures-normal-to-roughness-alpha-doesn.html

Basically, when using a normal to generate a roughness map, I get a White result on the alpha, no matter if it's empty or not. The other channels work fine, R G & B, Alpha seems broken. I tested this in 4.18 and 4.19

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