It's easy to see that the 22nd in May was a MONDAY!
The 5 May days ended on a Saturday and as most people already know, the SEC/EDGAR doesn't accept filings on the weekends.
As I said, the 22nd in May, was not shown as a "Business day" allowed by the SEC so the extension ends today, the 21ST!
My posted comments are only my considered opinion based on the reality as I see it. Your reality may be different.