When you kill a slime, it become white and doesn't keep the green texture and damage texture as you can see in the images
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Duplicate of MC-46560 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Ok I will do this next time.
Please do not mark unreleased versions (anything starting with "Future Version") as affected. You don't have access to them yet.