This is one of those issues where I appreciate having the DIS - because there is almost no way I'd have known this was even a thing until after it happened (and then wouldn't have even known what "it" was). Hoping it's fixed soon, but I'll post my experience when my June window opens next week if there are issues as well as any follow-up with Disney. Thanks to those tracking this.
The PP had it right - it's the V.I.Passholder event. And also think you're right that it shouldn't affect your MK day really at all.What's the AP event on 4/28? I tried google and didn't find anything (but Disney's website appears to be nothing but Stitch this morning).