Signs actually float in front of the wall instead of sticking to them.
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How to reproduce:
1. Place a block.
2. Place a sign.
3. Stand next to the side of the sign.
4. Observe the visible but small gap between the sign and the block.
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Thanks!
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Thank you for your report!
However, this issue has been closed as Won't Fix.
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Confirmed in version 1.16.220.51