All-day meetings don't display properly anymore (new issue 2 of 2)

Formerly, in the weekly calendar view in both Webmail and on my Android device's calendar app, all-day meetings sent to my mailbox.org account from an external email account, whether for one or several days, would display as a banner at the top of each day of the meeting. The Android app still displays them the same way, but mailbox's webmail now displays them instead as a big 24-hour block covering the whole day for each day of the meeting.

I'm not sure what changed, but it was in the past couple of weeks.