You can acquire as much dragons breath as fast as you can gather it. To replicate this potential bug you need to:
Destroy the end crystals
Have glass bottles
When the Dragon is perched upon the bedrock pillar and has started spewing out fumes, the area effect cloud gets smaller and smaller after you gather the dragons breath, until you get a slither of a hitbox, seen in image 2020-12-11_23.41.56, and this will expand after right clicking again and again. Using a fast click speed, you can expand the hitbox to extreme sizes, even being able to cover the entire island, as seen in image 2020-12-11_23.59.19. I don't know what else to add here. If you need more information please reply. Thanks 🙂
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This is actually a duplicate of MC-114618.
Please provide some additional screenshots or recordings of this issue occurring whilst the F3 debug screen is enabled.