There is a FORMULA bug when doing datetime comparison

I’m suspecting the formula will work improperly when put it into Render condition.

As you can see the MeetingDate__c is 7/22/2017, it’s definitely behind the NOW() value.

My logic is the MeetingDate__c < NOW() I will show the error prompt.

That is, in my case, the error prompt should not be there.
But it still shows

I also see the issue you’re seeing. I’ve notified our developers of the issue, and we’ll let you know when this is fixed in a future release.