Hi

I debugged this a little and see the regression occurred when sh-script.el
sh-font-lock-paren was changed in Emacs 30 to have:

                    ;; Also recognize OpenBSD's case X { ... } (bug#55764).
                    (and (looking-at ";\\(?:;&?\\|[&|]\\)\\|\\_<in\\|.{")

where the Emacs 29 had:


                    (and (looking-at ";[;&]\\|\\_<in")

when I modify Emacs 30 sh-script.el to revert this one line back to the
Emacs 29 content, we get the correct answer. I suspect reverting this line
is not the right thing to do. Rather, I hope it helps someone find the
solution.

Thanks
John