Scorm structure isn't respected after an update of the package

When a update is done for a Scorm activity with a new package containing a new item inserted in the old structure, this item always appears at the end of the structure list. (see screenshot in attachment)

This bug is very critic for users of Scorm activities because we must deleted the activity to put the new version (with the desired structure) suppressing the associated tracking...

I'm looking for an issue to this bug, i think the problem is in the structure list update.