Normal
This is working if you have a 2.0 signal. If you have a 5.1 signal the dialogs are already set to the correct speakers in the signal. So if my AVR gets a PCM 5.1 signal it doesn't understand why 3 of 5 channels are empty/muted and that it is not a 5.1 signal and should upmix the 2.0 signal. Because if the AVR got a 5.1 signal everything is already fine. Only qualizer, DSP, etc. are improving the audio playback, but not changing the location of speaker signal.