Incorrect sign text in Chunk data

[aremath]

Describe the bug
A clear and concise description of what the bug is.

When reading a world file using load_level and the calling .get_chunk(x,y), the returned Chunk object stores the signs that are in that chunk in the entity. The signs stored in block_entities do not have text, despite the in-game signs having text.

To Reproduce

from amulet import load_level
# A world with a sign
level = load_level("worlds/test")
# A chunk in the world with a sign
chunk = level.get_chunk(5,6)
for e in c.block_entities:
    print(e.nbt)

And output

NBTFile("":{utags: {Text4: "{\"text\":\"\"}", Text3: "{\"text\":\"\"}", Text2: "{\"text\":\"\"}", Text1: "{\"text\":\"\"}"}})
NBTFile("":{utags: {Text4: "{\"text\":\"\"}", Text3: "{\"text\":\"\"}", Text2: "{\"text\":\"\"}", Text1: "{\"text\":\"\"}"}})
NBTFile("":{utags: {Text4: "{\"text\":\"\"}", Text3: "{\"text\":\"\"}", Text2: "{\"text\":\"\"}", Text1: "{\"text\":\"\"}"}})

Expected behavior

NBTFile("":{utags: {Text4: "{\"text\":\"\"}", Text3: "{\"text\":\"THIS SIGN\"}", Text2: "{\"text\":\"TEXT ON\"}", Text1: "{\"text\":\"THERE IS\"}"}})
NBTFile("":{utags: {Text4: "{\"text\":\"\"}", Text3: "{\"text\":\"\"}", Text2: "{\"text\":\"\"}", Text1: "{\"text\":\"THIS ONE TOO\"}"}})
NBTFile("":{utags: {Text4: "{\"text\":\"\"}", Text3: "{\"text\":\"\"}", Text2: "{\"text\":\"\"}", Text1: "{\"text\":\"WHEEE\"}"}})

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 18.04.3 (Using Windows Subsystem for Linux)
• Program Version:
  • amulet-core: 1.2.0b6
  • amulet-nbt: 1.0.3.7
• Python Version: 3.9.2

[gentlegiantJGC]

Java/Bedrock? game version?

[gentlegiantJGC]

After a bit of testing I have reproduced the issue in Java 1.16.
It was caused by an issue in our NBT library. I don't know how it was not spotted sooner.

[gentlegiantJGC]

Amulet-Team/Amulet-NBT/pull/12 should fix this