[Bug 12026] ash: -sh not found, no echo

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=12026

--- Comment #2 from spam1 at reto-schneider.ch ---
I can reproduce it when I try to execute It happens when trying to call
shell-builtins from/in PS1:

Working: PS1="\$(date '+%s: ')$PS1"

root at hostname:~# PS1="\$(date '+%s: ')$PS1"
1573146144: root at GARDENA-163008:~#

Hanging: PS1="\$(echo 'MyPrefix ')$PS1"

root at hostname:~# PS1="\$(echo 'MyPrefix ')$PS1"
<hanging>

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