When we want to add a custom run script step, there is an option to select which type of script we want to write. The current release(3.1.2) is allowing to select all the radio buttons at a time.
Thanks for getting in touch, and thanks for reporting this!
I’m really sorry about this bug - we noticed this ourselves and we already have an issue open for it.
Until we can get a fix out (which should be very soon), you’re unfortunately restricted to PowerShell only.