While many new iPhone SE 2 owners are having a good experience on iOS 13.5.1, others are running into trouble.

If you just picked up Apple’s new iPhone SE 2, also known as iPhone SE 2020 and iPhone SE, your phone might be running an older version of iOS 13 out of the box. If that’s the case, you’ll be prompted to upgrade to iOS 13.5.1 which is the most up-to-date version of iOS 13.
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https://www.gottabemobile.com/7-things-to-know-about-the-iphone-se-2-ios-13-4-1-update/