PowerShell on MacOS Fails when running script from file

[jurgen_schober]

Trying to run a simple powershell script on MacOS fails when running a script (either as "Windows Powershell" or "Shell"). Inlines scripts with explicit path to pwsh work.

$ which pwsh
/usr/local/bin/pwsh

$pwsh --version
PowerShell 7.0.1$ uname -a
Darwin app-server-01.xxxx 18.7.0 Darwin Kernel Version 18.7.0: Mon Apr 27 20:09:39 PDT 2020; root:xnu-4903.278.35~1/RELEASE_X86_64 x86_64

With inline script:

14-Jul-2020 15:11:08	Powershell:
14-Jul-2020 15:11:09	Finished task 'Test' with result: Success

With script from file:

14-Jul-2020 15:11:09	Failing task since return code of [powershell -NonInteractive -ExecutionPolicy bypass -Command /bin/sh buildtools/pipeline/scripts/stopAppService.ps1] was -1 while expected 0
14-Jul-2020 15:11:09	Finished task 'Stop WebApp' with result: Failed

Why is there a "bin/sh" built in?