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If you're waiting to join the Beta program, installing the May 5th stable security patch may create a timestamp barrier to obtaining the May Beta 2 when it drops later the middle or end of May.
April Beta 1 was timestamped April 3, but didn't drop until April 22. Anyone who installed the April 5 stable security patch found they were unable to install Beta 1 OTA
If you're waiting to leave the Beta program, wait until you're offered an update which explicitly says "without wipe".