修正如下不解析问题
编辑\library\XenForo\BbCode\parser.phpCode:[mybbcode=[b]title[/b]]content[/mybbcode]
找到:
替换为:Code:$tagContentEndPosition = strpos($this->_text, ']', $tagStartPosition);
Code://$tagContentEndPosition =...

BbCode Options - Nested tags fix
BbCode修正