In 2019 1.2 Reflectivity not work
Please see the images
I have noticed some odd behavior with materials that use the “Reflectivity” slider in that shader. If you have a repeatable issue, you should create a Support ticket and submit it to them.
In the meantime, I would simply avoid the use of the “reflectivity” slider in that shader. If you look at the way all the different stock reflective materials in Zbrush are set up, few of them actually use that feature. There are different ways to set up reflections, and many actually use a separate dedicated shader for it.
how can i provide this support ticket ?