Labels not reflecting properly in GPU

[djnoone]

For the moment I have excepted that this is just the way GPU calculate surfaces, but in any case, I will ask if you know any better:

When rendering labels in CPU mode the light reflects equally for HDRI and local lighting.
When rendering label in GPU mode only HDRI make proper reflections, the local lighting disappears almost completely (partially on Area light, completely on spotlight).

Is there a workaround or things are as they are?