set the text of line 4 of field id 123?

[David Bovill]

These work as expected:

put newLine into line lineNum of field id fieldID
> set the htmltext of line lineNum of field id fieldID to newLine
>

So why on earth does this not work?

set the text of line lineNum of field id fieldID to newLine
>

I've always found the properties (text and htmltext) of text fields somewhat
inconsistent, and can never remember the ins and outs - so I 'think" this
has always been the case and is not a new bug in the beta. Can anyone make
sense of this for me?