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That's on Ubuntu 18.04.

$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 lip 23 12:00 /bin/sh -> dash

I am afraid the simplest fix is just to move to bash. There is an issue to move all scripts to /bin/sh so it can cleanup laster (and this issue was created because we already have at least one bash script).