In a nutshell: Apple rolled out macOS version 10.15.3 last week, which reportedly included a patch for a bug that it has known about since at least last summer. Before being fixed, it was possible to view encrypted email snippets as if they were not encrypted in Catalina.
Mac enthusiast and IT specialist Bob Gendler stumbled upon the bug in July 2019 and immediately reported it to Apple. When developers failed to issue a fix, Gendler publicly disclosed it in November.
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