Mailuser->Mail Filter The select2 move_junk do a reload tab on change but don't safe entry

Version 2.3.10

The select2 of move_junk fires on onchange or close the changeTab: event - (could not find out why).
This leads into following problem

Only happens if tab_change_discard = y in system_config.
If tab_change_discard = y than
ISPConfig.changeTab do
if(id) ISPConfig.loadContent(target, {'next_tab': next_tab, 'id': id});
this reload the tab in this case and no way to change the move_junk entry

if tab_change_discard != y than
ISPConfig.changeTab do
ISPConfig.submitForm('pageForm',target);

This works because the new entry got stored and the reload of the tab show the new entry

But think the source problem is the why the select2 move_junk fires the changeTab: event at all.
Don't think it is a problem with the changeTab function.