Patitoesp what you are seeing is simply the GPUz telling you what the PCIe lane is configured as. You are not getting Gen 3 from the graphic card.
By setting Gen 3 in BIOS you are enabling that capacity in the PCIe slot it will be utilised only if the hardware is able to use it. The Green team took away that capacity. They will bring it back when they fix what ever it was they needed to fix. I have no idea what or why they removed Gen3 from the drivers.
Think of it like this. You have a SATA 6G port, if you put a SATA2 Hard drive into that port it is still a 6G port and will be recorded as one. However the performance it delivers will be limited by the hardware connected to it.
That is how I see it. Hope that makes sense to you.
🙂
To help us help you - please provide as much information about your system and the problem as possible.