"Import Layout" does not always import the vocabulary name

Steps to reproduce:

• In my "View" layout, I have several "Multiple directory suggestion"
• Switch to "Edit" layout
• Select "Import Layout" (and import the "view" one)

=> The widgets are copied, but the reference to the vocabulary is not
=> Failure at runtime

Note: It looks like it's not specific to "multiple directory suggestion", but to every widget with a handle a vocabulary

For my use case (Sabre), there are 15 fields, so it was a bit annoying