Could be - though I get the same, of course. Given that the perl community (in general) frowns so heavily upon warnings being emitted at *any* stage, it's rather surprising that this sort of thing is tolerated. If there was a significant warning in there it would almost certainly pass unnoticed.
FAIK, a bug report for this already exists, and it's just a matter of waiting for someone with the time, desire and energy to step up and address the situation.