Think one of these 'work arounds' should work.
Have you removed the transponder(s) and then blind scan again to get it back.
(s) might need to remove all the transponders on the satellite ???????
(I like to reboot the receiver after removal, seems to work better here on the S9)
Maybe, just maybe, it's like my S9 on this transponder. It just doesn't like more than 1 h264 stream in the mux. To get the other two to work I had to use the editor on the computer and remove the two that don't work from the transponder. I then added another transponder with the same freq and polarity, changing the SR by -10. (S9 didn't like having them identical) Put in the PIDs and channel label. Loaded the file into the receiver and budda bing - The two 'missing' channels then worked.
Do not set the Service ID, or a scan will likely mess it up.