Fixes MC-103516

sources/src/main/java/io/akarin/server/mixin/core/MixinWorld.java

@@ -0,0 +1,34 @@
+package io.akarin.server.mixin.core;
+
+import java.util.List;
+
+import javax.annotation.Nullable;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+import net.minecraft.server.AxisAlignedBB;
+import net.minecraft.server.Entity;
+import net.minecraft.server.World;
+
+/**
+ * Fixes MC-103516(https://bugs.mojang.com/browse/MC-103516)
+ */
+@Mixin(value = World.class, remap = false)
+public abstract class MixinWorld {
+    @Shadow public abstract List<Entity> getEntities(@Nullable Entity entity, AxisAlignedBB box);
+    
+    /**
+     * Returns true if there are no solid, live entities in the specified AxisAlignedBB, excluding the given entity
+     */
+    public boolean a(AxisAlignedBB box, @Nullable Entity target) { // PAIL: checkNoEntityCollision
+        List<Entity> list = this.getEntities(null, box);
+        
+        for (Entity each : list) {
+            if (!each.dead && each.i && each != target && (target == null || !each.x(target))) { // PAIL: preventEntitySpawning - isRidingSameEntity
+                return false;
+            }
+        }
+        return true;
+    }
+}

sources/src/main/java/io/akarin/server/mixin/lighting/MixinWorld.java

@@ -34,7 +34,7 @@ import net.minecraft.server.IChunkProvider;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.World;
 
-@Mixin(value = World.class, remap = false)
+@Mixin(value = World.class, remap = false, priority = 1001)
 public abstract class MixinWorld {
     @Shadow protected IChunkProvider chunkProvider;
     @Shadow int[] J; // PAIL: lightUpdateBlockList

sources/src/main/resources/mixins.akarin.core.json

@@ -13,6 +13,7 @@
         "bootstrap.MetricsBootstrap",
         "bootstrap.MixinRestartCommand",
         
+        "core.MixinWorld",
         "core.MixinMCUtil",
         "core.MixinCommandBan",
         "core.MixinCommandKick",