These scripts, preamble and postscript are only evaluated when they are 
different than their previous versions. That is why I always suggest 
removing their contents when changing them.

Levente

On Mon, 14 Oct 2019, Marcel Taeumel wrote:

> Well, it seems to be that a "preamble" in a package is not evaluated when updating the image. Is this a bug?
> ChangeSet preambles also don't seem to be prepared to store a script. Just a documentation string. Why is that? :-)
> 
> Best,
> Marcel
> 
>