escape does not seem to work inside of attributes

[garyb01]

Examples:

[tooltip message="this is a \\]message"]prevented[/tooltip]

[tooltip message="this is \\[b\\]Text\\[/b\\] message"]prevented[/tooltip]

// Inconsistent tag '/tooltip'

Escaping standard nested tags works:

[u]start \\[s\\]Text\\[/s\\] end[/u]