Its a bug, they confirmed it over on reddit ~2 weeks ago
[quote]Thanks for the tag. We discovered this issue yesterday and are testing a fix now. The reduction in damage falloff when ADS is not intended for Duality or any other shotguns.[/quote]
https://old.reddit.com/r/CrucibleGuidebook/comments/16cwy5h/psa_do_not_use_duality_right_now/jzp4a64/
English
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Epic, they should list it in the bugs because it’s not there and hasn’t been mentioned anywhere else.
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90% of bugs aren't listed but they generally do know