Unexpected behavior from classdiagram class fields containing parentheses inside of brackets

[diceroll123]

Description

It seems that after parentheses close, anything after that is strictly put after the : for the class field.

I got this from a valid Python type annotation, https://github.com/fastapi/fastapi/blob/7c6f2f8fde68f488163376c9e92a59d46c491298/fastapi/datastructures.py#L64-L73 (see third line in my repro)

Steps to reproduce

classDiagram
    class Thing {
        + a()] blah
        + Literal[a("blah!")] blah
        + Annotated[Optional[str], Doc("The original file name.")] filename
    }

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