Uncrackable

Makes the dragon egg indestructible by any means, and adds minor feedback improvements to the teleportation mechanic.
Only required on the server side, though the client will generate its own teleportation trail without it.

Currently supports Fabric and Forge/NeoForge for versions 1.18.2, 1.19.4, 1.20.1, 1.21.1, 1.21.11, and 26.1.
Contributions for additional version support are welcome.

Scope

The goal of this mod is to prevent any case where the egg can be duplicated, deleted, or made to drop as an item.
Any method of doing these (aside from cheats or using previously obtained items from a vanilla world) is a bug.

This mod only affects game mechanics where the egg is involved; any fixes to vanilla bugs that would affect other blocks are special-cased so they only affect the dragon egg.

Functional changes

Changes that affect vanilla game mechanics

• Pushable by pistons
• Indestructible by mining or explosions, even while being pushed by pistons
• Lands on top of slabs and other pushable non-full blocks
• Destroys blocks when landing inside (for non-full blocks like torches, or if a block gets pushed inside while falling)
• Doesn't time out and drop as an item after 30 seconds like other falling blocks
• Remains a falling block if landing above build height
• Wraps around to build height when falling into the void
• Failing to teleport will not delete the egg
• Cannot be destroyed by ender dragons or withers

Feedback improvements

Changes that only affect player experience

• Teleportation sound effect added
• Teleportation particles correctly point to the new location

Known issues

Issues that can result in duplication, destruction, or item dropping of the egg.
These are not out of scope but are relatively obscure, hard to execute, and may be difficult to patch.
Contributions fixing these issues will be considered as long as they adhere to the project scope and do not cause other issues.

• Bedrock breaking glitches can be used to delete the egg
• Falling block duplication can be used to obtain multiple eggs
• Chunk savestating can be used to obtain multiple eggs
• Chunk regeneration can be used to delete the egg