sh command bogus output in UTF-8 text

[Jun Ebihara <jun%soum.co.jp@localhost>]

On NetBSD 9.99.42 NetBSD 9.99.42 (GENERIC) #0: 
Tue Jan 28 13:08:40 UTC 2020  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

http://ftp.netbsd.org/pub/NetBSD/misc/jun/sh-command-utf8-testing

cat seems fine,e3-81-ab -> e3-81-ab
amibase: {53} cat sh-command-utf8-testing |od -ax
0000000    c   a   t  sp   <   <  sp   E   O   F  nl  sp  sp  e3  81  ab
   6163    2074    3c3c    4520    464f    200a    e320    ab81
0000020   nl   E   O   F  nl
   450a    464f    000a
0000025

sh seems broken,e3-81-ab -> e3-81-81-ab
amibase: {54} sh sh-command-utf8-testing | od -ax
0000000   sp  sp  e3  81  81  ab  nl
   2020    81e3    ab81    000a
0000007

csh returns good ,e3-81-ab -> e3-81-ab
amibase: {55} csh sh-command-utf8-testing | od -ax
0000000   sp  sp  e3  81  ab  nl
   2020    81e3    0aab
0000006

--
Jun Ebihara