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As I know now jr. member also cannot wear a signature. All those people of this rank must be made a great panic here on the forum about this new rule. But I think it's a good change, at least now new users have more time to introduce with crypto and the forum and the reappearing of the same questions over and over will move to a minimum.
You are missing an important point!
As I know, new users, including Junior Members can definitely wear signature code, but they can not attach links to website, github, discord, facebook, twitter, etc. inside their signature. You can take my case as a specific example.