fix: implement ProjectileEntity#getOwner correctly (looks like MCPE-55823)

src/main/java/io/ib67/sfcraft/mixin/server/fixes/ProjectileEntityMixin.java

@@ -0,0 +1,62 @@
+package io.ib67.sfcraft.mixin.server.fixes;
+
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.projectile.ProjectileEntity;
+import net.minecraft.server.world.ServerWorld;
+import org.jetbrains.annotations.Nullable;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.UUID;
+
+@Mixin(ProjectileEntity.class)
+public class ProjectileEntityMixin {
+    @Shadow
+    private @Nullable Entity owner;
+
+    @Shadow
+    private @Nullable UUID ownerUuid;
+
+    @Unique
+    private boolean isPlayer;
+
+    @Inject(at = @At("HEAD"), method = "setOwner")
+    private void setOwner(@Nullable Entity owner, CallbackInfo ci) {
+        isPlayer = owner instanceof PlayerEntity;
+    }
+
+    /**
+     * @reason Implement the logic correctly.
+     */
+    @Overwrite
+    public @Nullable Entity getOwner() {
+        if (this.owner != null && !this.owner.isRemoved()) {
+            return this.owner;
+        } else if (this.ownerUuid != null) {
+            var server = $().getWorld().getServer();
+            if (server == null) {
+                return null;
+            }
+            if (isPlayer) {
+                return server.getPlayerManager().getPlayer(this.ownerUuid);
+            } else {
+                for (ServerWorld world : server.getWorlds()) {
+                    var entity = world.getEntity(this.ownerUuid);
+                    if (entity != null) return entity;
+                }
+            }
+        }
+        return null;
+    }
+
+    @Unique
+    private ProjectileEntity $() {
+        return (ProjectileEntity) (Object) this;
+    }
+}