They will be down mixed - you can’t just ignore the rear channels in a 5.1 for example as you’d ruin the audio mix, so all the channels are “folded down” for stereo for example. Usually this is fine but very rarely you’ll come across a disc that has issues folded down.
Atmos/DTS X is a bit different. Those extra sounds are in the core 7.1 mix, and only receivers compatible will be able to unpick the metadata and place them above. So even though it’s a bit different you still don’t lose actual sound just the discrete channels.
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