That's how the pattern seems to go, Amity.
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The most annoying part is the relatively recent innovation of clearing the text box after you complete the captcha. You used to be able to send it just fine, even if you had to solve a captcha every time you posted something or loaded another page.
Besides, it seems further progress is being made in the same direction: now, you can’t even recover your text with your browser’s “back” feature.
As long as this is going on, I highly recommend to everyone that you copy what you write before you try to post it, especially longer posts.