Since the 1.20.12 Hotfix Update was released, Lapis Lazuli and Bone Meal no longer work as dyes when changing the colour of text on signs. Instead it opens the interface for editing the sign's text. This also happens when sneaking.
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However, this issue has been closed as Working as Intended.
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Lapis Lazuli, Bone Meal, Inc Sacs, and Cocoa Beans no longer function as dyes and must be crafted into their respective dyes before being used. This works as intended.