edit: appears to be fixed with a recent update!

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If I use the right-arrow reply button next to the vote buttons at the bottom of the comment, it opens a reply to the main post instead.

If I use the “Reply” option under the three dot button, it opens a reply to the comment as expected.

I’ll try to get this on github at some point.

edit: observed on iOS 16.7.2, iPhone SE (latest model)