Got this setup:

The exported normal map is filled only with the noisy grain of the upmost layer (the screens). The wood normal is lost though it renders correctly.

Windows 10
ArmorPaint v0.8 (2020-03-19) - cc565e
Awesome, thanks for report.
Still needs more testing but it should work better now in latest builds.
I'll test 馃槈
Most helpful comment
I'll test 馃槈