Yup: "This is related to the bug affecting guest gallery download requests in unlisted galleries. Out of an abundance of caution, we’re testing a new flow and currently when a guest requests a gallery download from an unlisted gallery everything will look normal for them, and we’ll ask you to approve or deny the download request.
The only way around the approval is making the gallery public. There's no way, as of right now to turn that off.
If you have any questions or problems, please let us know."
Edit: I then asked about sending out a message so users know about this and I hope the support person bumped that up but they never directly responded to it.
"We're actually still digging and trying to come up with something easier for you, while still keeping your unlisted galleries protected."