This doesn't seem to be an app setting but something lemmy.word is filtering. What's the point of hiding but not blocking, and why this filter at all?
I heard Lemmy modding is "open", so is there some way to track and see why something like this is done?
Edit: see comments, it was actually an app setting but not something I changed/applied myself.
I checked again and you're right! I was looking under the filters heading but there's a separate block list heading.
I didn't actively block reddthat but I accidentally setup an account name and deleted and replaced it...I think deleting the account might have added reddthat to the block list, maybe?
You might want to edit your original post to correct this, then.
Same happened with me. I blocked an instance without realizing. My guess is that it's either a bug when block instance was being implemented or I just stumbled on the wrong option, since they are close to each other.