quoted string expansions of octal \001 value occurs twice in Process Substitution

[DeDominic, Anthony]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHT    YPE='x86_64-redhat-linux-gnu'
-DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale'
-DPACKAGE='bash'     -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include
-I./lib  -D_GNU_SOURCE -DRECYCLES_PIDS
-DDEFAULT_PATH    _VALUE='/usr/local/bin:/usr/bin'  -O2 -g -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2     -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-
switches -specs=/usr/lib    /rpm/redhat/redhat-hardened-cc1 -m64
-mtune=generic -Wno-parentheses -Wno-format-security
uname output: Linux adlinux.sim.gilbarco.com 4.12.13-300.fc26.x86_64 #1
SMP Thu Sep 14 16:00:38 UTC 2    017 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-redhat-linux-gnu

Bash Version: 4.4
Patch Level: 12
Release Status: release

Description:

     an octal/hex value of ctrl-a (\001) expanded by a quoted string
expansion appears to expand twice when in a process substitution. not
all octals expand twice however, such as \002


Repeat-By:
    >(echo -n $'\001' | wc -c)
    outputs 2 (ignoring the permission denied error)
    echo -n $'\001' | wc -c
    outputs 1

I tried to test all octals.

eval "$(for i in {01..77}; do (( 10#$i % 10 > 7 )) && continue; echo
'>(echo -n $'"'\0$i'"' >>test)'; done)"

using `xxd test` you can see there are only repeating \001's
00000000: 0101 0203 0405 0607 0809 0a0b 0c0d 0e0f  ................
...etc

no process substitution
eval "$(for i in {01..77}; do (( 10#$i % 10 > 7 )) && continue; echo
'echo -n $'"'\0$i'"' >>test2'; done)"

`xxd test2`
00000000: 0102 0304 0506 0708 090a 0b0c 0d0e 0f10  ................
...etc
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