If you place a sign and then place another sign on the front of the first sign, then any block that was in front of the first sign will get deleted.
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GoldenHelmet
GoldenHelmet
On further analysis, this is the same bug as MCPE-102371, so I am resolving this report as a Duplicate.
migrated
Video shared on the Mojira Discord: https://discord.com/channels/647810384031645728/648555681397342228/764722413840891934