This is substantially the same logic quirk as the old "ShellShock" bug in bash. Both of these take an expected "data" value (although here the "data" is the name of a module to import instead of the body of a shell function) and then execute code given after that value in the same string.
The best argument against calling this a security issue is that it must be either given on the command line or in $PERL5OPT — and you have bigger problems if either of those is within an attacker's control.
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