this bug is still not fixed in 4.57.6
suggested patch is present but commented out
see Exim.pm L442:
#BROKEN # strips new "special" content >= 4.10
#BROKEN $line =~ s/ (\d+),\d+#01$//;
#BROKEN if (defined $1) {
#BROKEN $line = substr($line, 0, length($line)-$1-1);
#BROKEN }