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It’s because your subject line had quotes in it… that throws things a little off and when it goes to write the subject, it already has one quote, then the first one you put is assumed to be the end-quote…

so the subject is assumed to be this empty string and it doesn’t display anything at all for the subject… so you, the author, unintentionally determined that no subject would be shown for that entry

*Scratches head… Good trick, LOL!