LtRt is, I believe, designed to be un-matrixed back to surround (i.e. Dolby ProLogic II encoding/decoding) - from back in the day when surround was hidden in the stereo mix (roughly: anything mono -> C, anything stereo -> LR anything 90° different -> LsRs).
I don't *think* anything is relying on PLII any more - any downmixed stereo is likely to be LoRo.
Isn't most stereo in Atmos/5.1 broadcast chain now derived from the LoRo downmix done by the receiver?
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