If you summon a block_display inside a block, and then teleport it out, the entity remains darkened as if it is inside a block or flickers back and forth from dark to light, even though it's no longer in the block.
Note that this behaviour fixes itself if you rejoin the world, and the block stops flickering and is lit correctly.
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We're tracking this issue in MC-259865, so this ticket is being resolved and linked as a duplicate.
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