Ardupilot TBS Nano Rx problem

Hello tbs firmware 6.42 public version for tbs nano has been released, there seems to be a problem with ardupilot 4.6. I just switched to the tbs crsf system and I haven’t tested it with previous ardupilot versions. When I plug the battery directly, the fc doesn’t see the receiver. But the remote connects to the receiver. If I reboot the ardupilot from the missionplanner compass section without removing the battery, it sees the receiver. There is no such problem with the tbs 6.48 beta version, but I don’t know how reliable the beta is. I also experienced bind lost problems with the 6.19 version, and now I’m afraid to fly.
My fc matek h743 slim v3
Rcın serial 7 Uart6 rx tx pin
Brd_alt_config 1

And if you leave it for a bit does it connect?

No not connecting. Need reboot ardupilot.I think there is a synchronization problem.

@andyp1per I set the RC_PROTOCOLS value from 1 to 512. Now working tbs nano rx v6.42 firmware.

Interesting - so the protocol discrimination is not working great. It could be that it is synchronizing on the wrong baud rate