When you dig a hole near a block that is on the ground, the block lights up, as seen in the video: https://youtu.be/g3_lXuWwPzg
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Affects 1.16.1

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Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.