The OP does not say that $scandir contains umlauts.
Neither my code nor the code the OP posted requires the utf8 pragma.
True, but the OP did mention "a SLES Linux with UTF-8 support switched on", and, strictly speaking, use utf8 is not the only means of getting $scandir flagged as UTF-8: 
binmode(STDIN, ':encoding(UTF-8)');
chomp(my $scandir = <STDIN>);

#OR
$ perl -CS -e 'chomp(my $scandir = <STDIN>); ...'

#OR
$ perl -CA -e 'my $scandir = shift; ...' <dir>

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In reply to Re^4: treat files with umlauts (utf) by hazylife
in thread treat files with umlauts (utf) by mike.scharnow

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