Sorry I can't reproduced.
My TV is only 1080p.
When I use the framerate switch and after the end of the, TV remains at 2160p 24Hz. - Settings - Display.
When I enter inside the Display, TV returns back to 1080p, 60Hz.
HDMI auto adaptation is marked at the beging and not marked after finish of the movie.
It happens in 2 from 3 plays.
Autoframerate switch V1.04.
TV Toshiba 55L7453.
I'm with your CFW 1.03.
2160p is not enabled in the settings.
I will install FW 1.05 and will report back.
Edit: No problem with FW 1.05