For some reason, you can place light blocks on top of a sign.
Steps to reproduce:
1. Create a world
2. Enable Caves And Chiffs Experimental Features
3. Type /give @s light_block in commands
4. Get a sign and place a sign on the ground
5. You can place light block on top of the sign.
If this bug does not make sense, let me know!🙂
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Comments 3
Almost any complete block (even lava and water) can be placed on the sign. Light blocks do not need specific support and are placed on any block that can be aim over.
Why do you think this is a bug? Light blocks are meant to be invisible light sources, so I would expect they can be placed anywhere.