I don't know why this message apparently wasn't showing up before, but the quest points have been this way since May, and the message has been in the code since July. We didn't announce a change because nothing was changed. Literally none of the files involved in this have been edited since July (and that was just the message about it on the finish screen).

This is how it's been for more than half a year - the message just got added.

Quote by Reaper

And just in case we need proof on the current error (it not resetting at midnight) - click the image to see it larger. You can clearly count how many quests I&;ve done (9) on the bar on the left:</p>
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the sidebar count does not include the one you just completed, because the sidebar is loaded before you technically complete the quest. so that quest was your 10th of the day.