A bug with the texture of these colors! Look closely, there is an extra pixel.
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Did you know that the white pixels that you were saying is a part of the Peony flower. The pixels were still in the first release of the Peony in Minecraft PE and PC as well. That is not a bug.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-15198.
It has been linked to this report. If you have additional information, please add it to that report.
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