What Perl version and OS? Behaves the same (i.e. throws the error) in both cases for me on 5.18.1 / Linux.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Unexpectedly no wide char error when stderr points at stdout by choroba
in thread Unexpectedly no wide char error when stderr points at stdout by peterp

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