In one of our projects, we used to have an issue type which a number of filters (which referenced both project/issue type) were based off of.
That issue type no longer exists in this project (but still exists in other projects), but the filters (and any corresponding subscription emails) display zero results giving the impression that the issue type still exists in the project even when it doesn't.
Is this expected or should the query throw an error? I would think the latter.