Some particles, such as torch flame and food crumbs, render behind water or rails. Torch flames, for example, render bluish, as if it was underwater. The same happens with food crumbs. Also, food crumbs render behind rails if the particles fall in the field that a sloped track covers. I have seen this bug occur on many Youtubers' games.
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Duplicate of MC-9553, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.