My main thoughts on what could've happened are:
1. Haneii has some kind of ninja ability, where I hear no sounds at night, but instead they are bolded the following day. This would most likely lead to him being scum, as I don't see this benefitting town.
2. Haneii was targetted/used an ability, and someone used something on me that involves me being unable to hear sounds, whilst also being unheard by others (Idk kinda like a commuter that targets someone else? Idk if a role like this exists but it's possible). This would be null, it wouldn't matter what role Haneii has.
3. Haneii got targetted by some kind of ninja scum, and is a JOAT with D3 doublevote, where when a second ability is used, they are bolded. This would of course lead to Haneii being town, as scum would not target one of their own teammates.
I'm not sure which of these is most likely, but considering my townread on Haneii right now, I'd say 1 is least likely, to me, although all of these explanations seem quite unlikely to me, they're just my main thoughts.