According to an
article on MacRumors, upgrading to Catalina can cause data loss in Apple Mail.
Quote:
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... updating Mail's data store from Mojave to Catalina sometimes says that it has succeeded, when in fact on closer inspection it turns out that large numbers of messages are incomplete or missing entirely.
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I’m not running Catalina, but I do know that the Mail app in iOS and iPadOS 13.1 are acting strange. More sloppiness by Apple I guess.