Hello marciak,
We did not find any issues in attached logs that may indicate issues with providing access to physical session on that host. Debug log level was not enabled, but nonetheless we can see entries that indicate connection to that physical session.
With that said, in .nx attached directory we can find nxplayer R- directories, where indeed is not physical session available. Maybe logs where send from client side (where nxplayer was running) not from server side host?