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Bug
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Resolution: Invalid
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Normal
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None
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None
I just attempted to upload a skin with a custom chunk for Minecraft Java edition. The extra chunk was scrubbed at some point before the client downloaded it.
Allowing for valid custom chunks would provide a basic means of "copy protection" for skins. You could create a "made by" chunk to "sign" a skin in a way that most people would not be able to see.
Please allow for custom PNG chunks.