Update of scripts in XWiki.SchedulerJobClass does not work

Steps to reproduce:

Create a page, add an object of type XWiki.SchedulerJobClass

• insert a script
• run the script
• change the script
• re-run the script

You will see, that the change made to the script is not used for subsequent runs, only the very first version is used.

Workaround:

• delete the whole page
• insert the changed script
• run

repeat for each change...