Not sure if this is the correct category, but https://worldofwarcraft.com/en-us/search?q=*test returns 500: Internal server error. This affects normal use of the site, e.g typo in a character search.
Same thing happens with (, ), and [.
Maybe it’s a WAF or something? Otherwise this seems like a bug because most other special characters I tried, like ;, :, and #, have no issue.