Presenting collaborative work in progress
Generally speaking, people should check with their collaborators before presenting joint work, including work in progress that may be controversial.  An exception might be an individual invitation for work that has been published and presented previously.
Certain fields, like particle physics, often have very large collaborations, and they usually implement very formal procedures for deciding who gets to represent the collaboration at what conference, and what official material can be presented.
If you don't have a formal mechanism in place, you're right it's probably good to chat with your colleagues in advance to set the ground rules.