Ok if the item expiry settings are honoured then it is a mystery why the items are being “evaporated” from the bucket.
From our activity log we can observe like within a 41-minute duration (definitely shorter than a day), the item count drops from 6 to 5. And this is not about the inconsistency of the view; the item is gone in the bucket, so we don’t expect the view to have it. Our application code to forcefully remove unwanted items hasn’t kicked in yet.
In fact, I think this explains the problem with Null string value on retrieving documents from bucket view when some times the view ends up with underlying null items - the item has disappeared from the bucket but has yet to sync itself according to the change.