development[pullrequests].open throws an error in JQL

[Zac Parker]

I was trying to look for open PRs, and I found the documentation that discusses it in the Atlassian site, but it seems to be throwing an error when it's done correctly, and not throwing an error when it's wrong. Here's what the "correct" version looks like:

I can't perform the search using the above criteria, even though it's got the checkmark indicating things are correct. Here's what I see when I do it "incorrectly":

Able to perform the search without issue, even though it's saying there's a problem. 

This wouldn't be a problem except for the fact that when I try to use a dashboard widget to build and run this query, the widget won't accept the "incorrect" version, and will accept the "correct" version, however the "correct" version doesn't actually run because the JQL is incomplete. 

What am I doing wrong here?