Harmonic Function Expression Bug

Synfire 2.0.13 Build #9 as well as newer 2.0.14 Build #3 on Mac OS Venture 13.0.1 / M1 chip.

I am trying to follow the docs, section References/ Harmonic Functions / Interlude Harmonies.

When I enter the function expression

as presented in docs (see also screenshot) the app gets frozen and cannot be used any more.

Any fix on that?

EDIT 2023-01-02:

Remains a fatal error in 2.0.14 Build 4.

@Andre: Can you reproduce and consider to fix (or update docu) ?