here is a bug with the string for FX Params on OSC devices
https://www.youtube.com/watch?v=N8lIeQc0s5I
its the same one you fixed with last touched parameter strings,
the one where the string would display on the osc device fine when moving the parameter from reaper with the mouse but would vanish when you used the osc device to move the parameter
if my explanation confused as much as it confused me just watch the video
Subz