I have a Kindle Collection being created from a tag called 'science fiction' with several hundred books that should remain after the collections are generated.
I also have a rule that says not to create a collection from a *series* if there are less than 2 books in it.
Somehow, this has started deleting the tag collection after being created, even though a similarly sized one 'fantasy' is left alone.
The only difference between the two that might be relevant is the space in the middle.
This worked well before the 2.0 release, and is still buggy in 2.5 (and the latest version of the Kindle Collections plugin. I hadn't updated the books on the device in a while, so am not sure when the problem appeared.
Here is a screenshot of the plugin setttings:
Here is the relevant section of the report: