I just ran across this thread, and I can confirm that I have the same issue. I made the inverter circuit, and it works fine with the older R6203SB, but will not work with the new R7008SB.
I have a logic analyzer, and can certainly post a capture from the old and new receiver if anyone is interested in working on it. Sadly, my coding ability is nearly non-existent, so it's not likely anything I can fix.
Cheer,
Rusty