XPathManupulator parentesis handling bug

Consider following input:

• prefix: descendant-or-self::*[@id = 'checkbox-with-preceding-label']
• xpath: (//label[@for = 'checkbox-with-preceding-label'])[1]

I expect result to be descendant-or-self::*[@id = 'checkbox-with-preceding-label']/(//label[@for = 'checkbox-with-preceding-label'])[1] (both prefix and xpath combined using /).

In reality this produced this xpath: (descendant-or-self::*[@id = 'checkbox-with-preceding-label']//label[@for = 'checkbox-with-preceding-label'])[1] (the prefix is injected into parenthesis and produces xpath that doesn't match what's expected).

I'm using parentheses in xpath to specify which of found elements I want to get. It as well can be 5th element, so using find instead of findAll method isn't a viable solution.

P.S.
I'm trying to find matching label by for attribute across the document, but I start with checkbox xpath, that I can't change.

Start by locating the XPathManupulator implementation and reproduce the issue with the prefix and parenthesized XPath shown in the report. Compare the generated XPath with the expected slash-combined form; done means parenthesized element selection preserves the intended scope and existing behavior remains intact.