Description

Steps to reproduce:

1. Go to https://wikifunctions.beta.wmflabs.org/wiki/Z10112?view=default-view&action=edit
2. Expand the first item under the "Labels" multilingual string
   
   • The dropdown should be active, because we should be able to change from literal to reference or to function call (mode)
   • However, the expand toggle should not be active, because we should not be able to change the type, only the mode:
     
   • I can change the type of an item (which I shouldn't), resulting on a non-wellformed ZObject:
     

Expected behavior (Acceptance criteria):

• If an item in a typed list has its type bound (e.g. [ "Z11", item, item, item ] all items should be of type "Z11"), I should be able to change their mode but not their type

Devices and Design (URLs or screenshots, if applicable):

• Desktop: ...
• Small screens/mobile: ...

Completion checklist

• Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Front-end_Task/Bug_Completion_Checklist