Compare torches and iron bars.
This could be fixed by converting signs over to block models instead of forcing them to use entity rendering (making only the text use block entity rendering), and then reviewing the proportions of the post.
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There are many other cases of pixel proportions being off which are considered valid, such as MC-109055, which is still valid despite cocoa pods always having said proportion.
How exactly is this a bug, what issues does it cause? Signs have always has this proportion.