So the CM I spoke with just put a complimentary 1-day pass on my account specifically for 6/1 "just in case - this looks like a glitch, but I don't want you to miss your reservation either way!"
She explained that everyone she spoke with is in agreement that the single blockout date is so weird, and they've elevated it to the "highest level of passholder CMs," but she didn't want my existing plans to be swiped out from under me in the rare case that this held. I didn't even ask - I assumed she was going to just tell me to call back and check, but she encouraged me to screenshot my plans and she'd add this ticket just in case.
Wow. That was so, so kind of her, I'm still in a bit of post-call happy shock.