docstring not working in Python on VS Code

I use standard docstring format, there is a useful example here: What are the most common Python docstring formats?

So here is example code:

def function(a: str, b:bool, c:int):
    ''' the function doc string. 
    Here is a bit more.
    
    args:
        a: a random string goes here (str)
        b: lets describe something binary (bool)
        c: we have a whole number (int)

    return:
        gives something back


    '''
    
    a = a + ' world'
    b = 5 * b
    c = 10 + c


    return c

When I hover over the function definition in VS Code, the description is nicely formatted. Each argument is on its own separate line:

But I like to add the types at the beginning, like this:

def function(a: str, b:bool, c:int):
    ''' the function doc string. 
    Here is a bit more.
    
    args:
        a: (str) a random string goes here
        b: (bool) lets describe something binary
        c: (int) we have a whole number

    return:
        gives something back


    '''
    
    a = a + ' world'
    b = 5 * b
    c = 10 + c


    return c

Now when I hover over the function definition the args are all merged onto one line:

I notice that this is caused by the parentheses around the types and removing them removes the problem.

I also note that if I print the docstring, it looks how it should be, so it is like VS Code has an issue with the parentheses:

print(function.__doc__)

returns this:

 the function doc string. 
    Here is a bit more.
    
    args:
        a: (str) a random string goes here
        b: (bool) lets describe something binary
        c: (int) we have a whole number

    return:
        gives something back

But why is this the case and how can I get it back to normal (keeping the parentheses)?