Pit mode doesnt works IFlight Blitz 1.2G 1.6W

[IvanLeu]

Problem with IFlight Blitz 1.2G 1.6W in Plane 4.5.6. The pit mode doesn't work, even though the power changes right. In logs I've seen that Tramp always sends command "I": 0. Even when I physically turn on the pit mode on the VTX it's still changes power. And pit mode isn't indicator isn't turning off. I've noticed that the pit mode in VTX_Options is turning off when I set it to 1. So when I write 13 to the Vtx options, on the next refresh it is back 12. How do I fix this problem?

Platform
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[ ] AntennaTracker
[ ] Copter
[ X] Plane
[ ] Rover
[ ] Submarine