Not a regression.
Posting an inline link with nested parentheses in the URL does not work.
Steps to reproduce
1. Post this message: " how about: [hmm](https://somewhere?param=(currentUser()))? "
Expect inline link with title hmm and URL https://somewhere?param=(currentUser())
No inline link. The original markdown syntax appears directly. However, part of the URL (https://somewhere?param=) is then detected as an auto link and becomes clickable.
PR recently merged into master. See description for testing.