The earliest instance I can remember such a thing happening was back in WotLK, when Blizzard broke the AVR add-on, which was used to draw on the game world to assist with raid positioning.
Article w/ Blue Post: https://www.engadget.com/2010-05-20-...tch-3-3-5.html
Example: https://www.youtube.com/watch?v=fimaiHFp3aM
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