Mechanic Rollback brings back Java Edition mechanics that recent updates changed or removed. Each feature can be switched off on its own. There are no dependencies, and Fabric API is not needed. The mod is server-side: drop it into your server's mods folder and players can join without installing anything.
| Feature | Removed / changed in | Config key |
|---|---|---|
Spawn chunks: the chunks around world spawn stay loaded and keep ticking with nobody nearby, like before. The radius works like the old spawnChunkRadius game rule (default 2). |
1.21.9 | spawnChunks, spawnChunkRadius |
| Old Mining Fatigue: Mining Fatigue III (Elder Guardians) is back to its old strength. It was 10x weaker in 26.3. | 26.3 | legacyMiningFatigue |
| Shield knockback: a hit that is fully blocked by a shield knocks the blocker back again. | 26.3 | shieldKnockback |
| Endermen in boats/minecarts dodge projectiles again, so enderman holding cells and farms keep working. | 26.3 | endermanProjectileImmunity |
config/vanillarestore.json is created on first start. Set any option to false to get the current vanilla behaviour. Restart the server after editing.
{
"spawnChunks": true,
"spawnChunkRadius": 2,
"legacyMiningFatigue": true,
"shieldKnockback": true,
"endermanProjectileImmunity": true
}Minecraft 26.3, Fabric Loader 0.19.5+, Java 25.
