This is documented in perl5101delta, under "Other Incompatible Changes":
This one is actually a change introduced in 5.10.0, but it was missed from that release's perldelta, so it is mentioned here instead.
A bugfix related to the handling of the /m modifier and qr resulted in a change of behaviour between 5.8.x and 5.10.0:
# matches in 5.8.x, doesn't match in 5.10.0
$re = qr/^bar/; "foo\nbar" =~ /$re/m;
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