Impossible to correct an error in function description

[Strakovo]

When an error occures in function syntax, a bar appears over all function description content and is invisible. It is impossible to correct the mistake, while the bar persists whenever the function description is focused.

[ChristopherChudzicki]

What I see is a red underline, and the function is still editable (see below).

If this is not what you see, could you post a screenshot and share a link to the graph ("Share" in upper right corner).