новый пакет PlayerBlockPlacementPacket

proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/State.java

@@ -85,6 +85,7 @@ public enum State {
                     .put(0x15, EntityActionPacket.class)
                     .put(0x1A, HeldItemChangePacket.class)
                     .put(0x1D, AnimationPacket.class)
+                    .put(0x1F, PlayerBlockPlacementPacket.class)
                     .build(),
             ImmutableMap.<Class<? extends SCPacket>, Integer>builder()
                     .put(BossBarPacket.class, 0x0C)

proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/PlayerBlockPlacementPacket.java

@@ -1,4 +1,31 @@
 package mc.core.network.proto_1_12_2.packets;
 
-public class PlayerBlockPlacementPacket {
+import lombok.Getter;
+import lombok.ToString;
+import mc.core.Location;
+import mc.core.network.CSPacket;
+import mc.core.network.NetInputStream;
+import mc.core.network.proto_1_12_2.Direction;
+import mc.core.utils.CompactedCoords;
+
+@Getter
+@ToString
+public class PlayerBlockPlacementPacket implements CSPacket {
+    private Location location;
+    private Direction face;
+    /** true - main hand; false - off hand */
+    private boolean hand;
+    private float cursorX, cursorY, cursorZ;
+
+    @Override
+    public void readSelf(NetInputStream netStream) {
+        long compactedCoords = netStream.readLong();
+        double[] xyz = CompactedCoords.uncompressXYZ(compactedCoords);
+        location = new Location(xyz[0], xyz[1], xyz[2], null);
+        face = Direction.getById(netStream.readVarInt());
+        hand = (netStream.readVarInt() == 1);
+        cursorX = netStream.readFloat();
+        cursorY = netStream.readFloat();
+        cursorZ = netStream.readFloat();
+    }
 }