RPNs in Studio Instruments
I'd like to know how RPNs are handled by Studio Instruments plug-ins.
Some of MIDI files contain RPN#0 for setting pitch bend sensitivity for GM-compatible instruments, but Studio Instruments plug-ins normally become silent when they receive it. I've understood that each RPN has a registered meaning and assumed that it is ignored if it cannot be handled properly. So I cannot believe Studio Instruments plug-ins' behavior.
Is there any description or table on how Studio Instruments plug-ins implement RPNs?
Thanks in advance.