This is a small bug, I found it while playing on my laptop. When you hover over the item in your inventory or scroll to it in your hotbar, the game calls it bone meal instead of white dye.
Edit: Brown Dye, Black Dye and Blue Dye are also called the wrong name; Brown is called Cocoa Beans, Black is called Ink Sac, Blue is called Lapis Lazuli.
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We're tracking this issue in MCPE-153522, so this ticket is being resolved and linked as a duplicate.
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