Your code:
my @fifth = @arr[ map {$_*5-1} 1..$#arr+4/5 ];
adds a fraction (4/5) to the last array index.
So adding appropriate parentheses:
my @fifth = @arr[ map {$_*5-1} 1..($#arr+4)/5 ];
seems better but it does not work for all array lengths.
(It works if the length modulo 5 is 0 or 1 only.)
Changing the 4 to a 1 (aka the array length) does the trick:
my @fifth = @arr[ map {$_*5-1} 1..($#arr+1)/5 ];
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