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Coincidentally, I came across an article on ars technica. It seems fake HDR (SDR in an HDR wrapper) is a thing as is fake 4K (upscaled 2K). Fake Atmos? Not sure, but there's this comment:
https://arstechnica.com/gadgets/2019...mment-38325705
This one suggests that the Disney+ app itself does not support atmos, at least on external speakers (C7 tv)...
https://arstechnica.com/gadgets/2019...mment-38325885
I can't say that these comments are correct, but perhaps you need to check
A) Is the content actually what it claims to be?
B) Does the equipment / software properly support and display the format?
EDIT: Reading on, someone states there is a known bug in the app soon to be fixed and there are claims about problems with the Netflix app on Samsung TVs. I'm not clear if your problem is consistent across apps / sources, but it might be that the HW manufacturers are supplying code to the content producers to include in their apps. If the code is buggy in some way, that might be replicated in different apps or it might be the code in the TV itself. However, I expect that as long as the H/W is actually capable of reproducing various content types, software bugs can be fixed, so check LG's support forums.
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