Steps to reproduce:
- Send a message from Inbox
- Create a 2nd message in that same thread using Gmail API's "insert" method
- Delete the first message either from the API or from Gmail (but really delete it, not just put it into trash)
Result: the 2nd message seems to get somehow disconnected from the thread and Inbox acts weirdly on it (see video if curious -- the weird behaviour itself starts at 2:10).
Bug or feature?
How to avoid it?