I'm sorry to say but that is a placebo effect
That option is now defunct and default to 'ON' within the code (it's hard coded) and has been that way since beta release 3.21.140
I noticed in you original post you mentioned noticing this whilst on the ground... if that is the case the likely cause is a difference between MSFS real local weather and that determined by PF3, using our own real weather source. This of course could rear its ugly head intermittently. Nothing that be done unfortunately as Asobo do not provide a weather interface, probably due to licensing terms and conditions from wherever they source the data.