I observe strange behavior of the material if I add a normal bump map to the clearcoat bump slot, and vice versa, if I use a normal map in the base bump slot, then the clearcoat layer looks like inheriting the bumps of the base layer, is it expected?
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Not happening for me here - Corona Bitmap to Corona Normal to Base Bump, the Clear Coat is unaffected (unlike with the daily build before this one, be sure to be using the one from yesterday). Can you share images, grabs of the material set up, etc. ?
EDIT - or do you mean if you add a second normal, to the Clear Coat bump, only then does the Base Bump show through?
EDIT 2 - I tested the second case and I see what you mean, if there is a normal map in both Base and Clear Coat, the Base normal still affects the Clear Coat. It's not what I'd have expected so I will ask :)