Hello @Dario, I'm having this same issue. I'm trying to use Unity's sample actions asset that's based on Open XR and I'm seeing no position tracking.
I tried changing from generic controller (even if I shouldn't) to vive specific controllers and still no luck.
I set input in player settings to both, but I can't downgrade XR interaction toolkit from 1.0.0-pre.5, there are many critical bug fixes and features since 0.9.
Also, if I do that, I would need to do the extra work to recreate the action input mapping for HTC vive and other platforms too.