No thunderstorm

Hi,
I unfortunately have a bug: when the metar says thunderstorm (TS) or rain with thunderstorm in FSX I have no ran or thunderstorm. When the metar shifts to only rain I have rain in FSX. I use Fsuipc (unregistered) with simconnect and REX Essential + clouds. It was a real weather (VATSIM) a few days ago on EPWA and today in EPRZ.
Jacek