QLowEnergyService discoverDetails does not work for custom service

QLowEnergyService::discoverDetails() works perfectly with known services like:
"Generic Attribute"

"Device Information"

but when I call this method on following service instance, the discovery will start, but never end:
0000fff0-0000-1000-8000-00805f9b34fb (Tabu Lumen Service - a RGB light bulb)

The hardware is ok, it works with gatttool. All information about the services and characteristics I found are in the attached file.

PS: awesome work!