Prerequisites

• I am running the latest alpha version of MineColonies and Structurize for my Minecraft version.
• I checked the MineColonies/Structurize wiki and made sure my issue is not covered there.
• I made sure that this issue is not a duplicate of any existing issue.

Context

• Minecraft Version: 1.16.5
• MineColonies Version: 1.0.182-alpha
• Structurize Version: 1.0.252-alpha
• Related Mods and their Versions: none

Expected behavior

The guard towers should load as expected and function properly

Actual behavior

When clicking on any guard tower or barracks tower, it tells that the block is missing its building.
Restoring a backup doesn't change that.

Steps to reproduce the issue

1. Load a world in 1.0.176 with guard towers and barracks towers
2. Build a guard tower or barracks tower
3. Update to 1.0.182
4. Try to access the guard tower's gui

Logs

• latest.log: https://gist.github.com/MotionlessTrain/78cc3febfee1aa0aa91c4778a4e29569

Notes

I noticed it when my rallying banner wished me good luck rallying no guards. The interface showed illegal towers, so I removed them and wanted to re-add the guard towers. But the barracks tower I wanted to add turned out to be missing its building.

The log shows that deserialising the NBT went wrong. I think something changed during versions so that old NBT is not compatible with the new one.
The problems seems to be with just guard towers, as I was able to access an apiary's gui without problem

Viewers

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Was also reported on a 1.17 version as well, after updating versions to 1.0.181-alpha

Fix pushed