A user at en.wp reported today that you can add interlanguage links while you're in VE. The last step when doing so means the whole page gets reloaded, so whatever was done in VE until that moment gets lost. I am not aware of ways to prevent this, and there is no indication in VE that this will happen when you start that procedure.
Whiteboard: u=dev c=backend p=0
T54105: VisualEditor: Ability to edit language links on Wikidata from within the editor