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 checked made sure that this issue is not a duplicate of any existing issue.

Context

• Minecraft Version: 1.16.2
• MineColonies Version: 0.13.197-ALPHA
• Structurize Version: 0.13.57-ALPHA
• Related Mods and their Versions:
  • Forge: 33.0.22

NO OptiFine, no shader

Expected behavior

Iron Racks being displayed, not invisible.

Actual behavior

Some Iron Racks are fully or partially (1/2 block) invisible - frame is draw if pointing at it. Inventory can be opened.
Placing items inside the Rack sometimes makes it visible, other times the second, visible block also disappears.
Breaking the blocks, replacing them and eventually putting some item inside (and optionally removing it again), solves the problem.

Screenshot:

Steps to reproduce the issue

1. Create a new (creative) world (single-player);
2. Start a colony;
3. Set a warehouse (tested with darkoak and wooden) using bottom rightmost icon of building tool

Logs

Notes

Also happens in survival-mode/server; and warehouse built by builder.
(Discord entry)

Eventually related: #5420 (some of the visible racks were not correctly connected until image changed by placing items inside)

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