"%" renders as nothing when creating a new tag

Question

When I type the "%" sign when creating a new tag, it later doesn't render, shown below.

Answer 1

The Help Center article Create new tags says:

When creating your new tag, bear in mind that tags ...

• must be no longer than 35 characters
• must use the character set a-z 0-9 + # - .

The percent sign is not among them, that's why it's not rendered.

Bear in mind that the same article says:

When should I create new tags?

Most common tags already exist on a mature site. You should always favor existing tags; only create new tags when you feel you can make a strong case that your question does cover a new topic that nobody else has asked about before on this site.

(something similar is stated here)

A tag that covers one single error message is generally speaking way too specific, and don't worry about users not being able to find those questions: just searching for 'more % conversions' already gives you what you need.

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Incidentally, something similar holds for this question. Instead of creating a new-tag-bug it's better to tag it bug and tags.