The default tag dashboard vanity is localhost:4502/aem/tags or navigate via Tools > General > Tagging. Using this console, you may add specific special characters that are allowed to be present in name/title of a tag.
Yes in the same console, when I try to create tag , its taking special characters, But in 6.2 even If I give special characters i was getting converted to hyphen. In 6.4 the special characters name/title are not getting converted to hyphen.
Ideally the title field should not accept any special charters or it should convert special characters into hyphen