The feedback app disappears when your device is no longer on a beta version of iOS. The build number of the last beta of iOS 13.4 is the same as that of the publicly released version, which means they’re the same build.
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An Apple Watch on watchOS 7 beta will only connect with an iPhone on iOS 14 beta. If you revert your iPhone to iOS 13.5.1 and don’t plan on reinstalling iOS 14 beta on your iPhone you’ll have to send your Apple Watch to Apple to have it reverted to the latest public release of watchOS 6.