Some bbcode rules (e.g. [code], [spoiler]) can be treated as block or inline rules. Currently, if a line begins with e.g. [code] and ends with [/code], the line is parsed as a block rule. Sometimes this behaviour is not intended.
For example, the line
[code]123[/code] 456 [code]789[/code]
is rendered
123[/code] 456 [code]789and not
123 456 789.
Likewise,
[spoiler]123[/spoiler] 456 [spoiler]789[/spoiler]
is
123[/spoiler] 456 [spoiler]789
and not
123 456 789.
Is this intended or a bug?