I was previewing an email and the email had a button(2 rows of words) with all white letters and was able to be connected/linked to a document. When the email was sent, the top row was white and the bottom was black. Only the top row of words was linked to the document but the bottom row wasn't. There was no way to know about the error until the email was sent out, and there was no way to correct it because it was showing correctly before it was sent.
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