IRC Tramp and PIT mode ON

Does turning on PIT Mode works for anyone using IRC Tramp protocol?
On my Foxeer Reaper Extreme 2.5W PIT mode can be only turned off, not on. And looking at INAV code - they don’t support turning on PIT mode at all when using IRC Tramp.

So, I’m wondering if this is a limitation of this specific VTX, or it’s not supported at all with this protocol?
Debug logs show that command ‘I: 1’ is correctly transmitted by ArduPilot, but VTX ignores that.