steam:// protocol URL BB-code is broken

[shavit]

Latest XenForo version. Occurs here on the official XF forums as well.
steam://controllerconfig/windia/2775444134

If you check my message's contents, this is the text behind the BB-code:
Code:

[URL='steam://controllerconfig/windia/2775444134']steam://controllerconfig/windia/2775444134[/URL]

However the generated "a" HTML tag is:
Code:

http://steam://controllerconfig/windia/2775444134

When the protocol is never specified as http in my URL tag.

Can't figure out where to add new protocols. What can I do?


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