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Hi Alvaro, I take it you can connect to the hotspot ok, have you tried SSH and seen if that works ok.
There shouldn't be an issue with Real VNC as it will use the same ip of 192.168.50.10. On the PI using the Desktop; when you open the VNC window with the icon by the clock, does it suggest the same ip? below that is option to show other connection settings, this also should only say the Hotspot ip, if there is a different ip then the setup is not right.

If your Wifi Icon is not the up and down arrows then it maybe that wpa_supplicant is still running along with the hotspot which will cause issues.
Just check the /etc/network/interfaces file doesn't have any config and /etc/dhcpcd.conf contains the line: nohook wpa_supplicant

If you still have issues, let me know what info you get and I will look into it futrther.