I can confirm the behaviour in 5.25.5 (built on September 16) on Linux.
#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };
my $nix = << '__NIX__';
line 1
line 2
__NIX__
my $win = << '__WIN__'; # ^M present at end of lines.
line 1
line 2
__WIN__
# ^M present here, too:
my $quoted = 'line1
line2
';
say /\r/ for $nix, $win, $quoted;
I can't find it documented anywhere.
Update: It doesn't work for normal quoted strings, either.
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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