Script editor chops "end handler" to "nd handler"

[hh]

I cannot confirm this, it's even more:
"en" is chopped.

[Also, sometimes: When hitting immediately after that the backspace key a zero appears.]

This is only with code that is not "beautified" (all lines begin at left). I tried my own, not your demo.

[I had also _sometimes_ similar chopping when I opened in LC 8/9 a 6.7.11 script, *without* any edit.]

MacOS 10.12.3 - LC 8.1.3rc1 AND LC 9.0.0dp4