That's a long known issue which can only be solved by patching cperl-mode.
I identified the necessary changes in a discussion in "gnu emacs help" some years ago and Ilya welcomed any patches...¹
Don't know if recent versions already solved this...
HTH ! =)
( addicted to the Perl Programming Language)
An easy workaround is to put the opening bracket into the next line...
Sorry can't demonstrate while on mobile...
See also http://www.emacswiki.org/emacs/IndentingPerl
¹) see here CPerl-Mode Indentation
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