Just an update on this:
Currently this is expected (lights may still appear as black when seen in reflections or refractions).
We would like to fix it, however it will require a lot of work and caution not to break something else.
There is a workaround for this (using Corona Light Mtl instead of light objects):
-use the rayswitch material: standard light mtl should be used for GI, and light mtl with "emit light" option off should be used for direct visibility, reflections, and refraction.