Whenever you place a painting or a sign on a wall, there's a chance it will be gone when reloading a world. This makes me upset because it has happened multiple times, and I wanted to make an art museum.
Again, I do not have a photo or video of this bug
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I can't reproduce this in 1.1.0.0.

I added the 2 photos, The first one is when I placed it, and the second one is when I logged off and back on.

+1 on 1.0.0.5 on torch and sign.
A sign with a torch above it have detached on several game starts now and were on the ground.
Checked using maps, the torch and sign are confirmed to be in a different chunk to the block they are attached to. Bordering North (torch/sign) South (Sandstone Block).
Standing next to them after a save/start, while the chunks were loading around me I heard the "pop" of the detached torch and sign being placed in my inventory.

Duplicates MCPE-11477,
no need to add my previous comment to that ticket as it does not add anything new.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-11477.
It has been linked to this report. If you have additional information, please add it to that report.
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I'm playing in bedrock edition 1.11.4, on an Xbox one, in a realm. My character is standing at Y 69, and facing north. When placing oak sign, on top of the stone block in front of me, I assume Y 69 also, no matter the text I try entering on the sign, it disappears