diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
index 2cffd1ffc..cebd1e1ad 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
@@ -1731,6 +1731,9 @@ public class Animation {
 			return slotIndex;
 		}
 
+		/** The attachment for which the {@link SlotPose#getSequenceIndex()} will be set.
+		 * <p>
+		 * See {@link VertexAttachment#getTimelineAttachment()}. */
 		public Attachment getAttachment () {
 			return (Attachment)attachment;
 		}
@@ -1753,10 +1756,7 @@ public class Animation {
 			SlotPose pose = appliedPose ? slot.applied : slot.pose;
 
 			Attachment slotAttachment = pose.attachment;
-			if (slotAttachment != attachment) {
-				if (!(slotAttachment instanceof VertexAttachment vertexAttachment)
-					|| vertexAttachment.getTimelineAttachment() != attachment) return;
-			}
+			if (!(slotAttachment instanceof HasSequence hasSequence) || slotAttachment.getTimelineAttachment() != attachment) return;
 
 			if (direction == out) {
 				if (blend == setup) pose.setSequenceIndex(-1);
@@ -1774,7 +1774,7 @@ public class Animation {
 			int modeAndIndex = (int)frames[i + MODE];
 			float delay = frames[i + DELAY];
 
-			int index = modeAndIndex >> 4, count = (((HasSequence)slotAttachment).getSequence()).getRegions().length;
+			int index = modeAndIndex >> 4, count = hasSequence.getSequence().getRegions().length;
 			SequenceMode mode = SequenceMode.values[modeAndIndex & 0xf];
 			if (mode != SequenceMode.hold) {
 				index += (time - before) / delay + 0.0001f;
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/Attachment.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/Attachment.java
index 5b448094c..4f0f464a4 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/Attachment.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/Attachment.java
@@ -29,18 +29,34 @@
 
 package com.esotericsoftware.spine.attachments;
 
+import com.badlogic.gdx.utils.Null;
+
 /** The base class for all attachments. */
 abstract public class Attachment {
 	final String name;
+	@Null Attachment timelineAttachment;
 
 	public Attachment (String name) {
 		if (name == null) throw new IllegalArgumentException("name cannot be null.");
 		this.name = name;
+		timelineAttachment = this;
 	}
 
 	/** Copy constructor. */
 	protected Attachment (Attachment other) {
 		name = other.name;
+		timelineAttachment = other.timelineAttachment;
+	}
+
+	/** Timelines for the timeline attachment are also applied to this attachment.
+	 * @return May be null if no attachment-specific timelines should be applied. */
+	public @Null Attachment getTimelineAttachment () {
+		return timelineAttachment;
+	}
+
+	/** @param timelineAttachment May be null if no attachment-specific timelines should be applied. */
+	public void setTimelineAttachment (@Null Attachment timelineAttachment) {
+		this.timelineAttachment = timelineAttachment;
 	}
 
 	/** The attachment's name. */
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/VertexAttachment.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/VertexAttachment.java
index f18c0a59c..451a1c97a 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/VertexAttachment.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/VertexAttachment.java
@@ -46,7 +46,6 @@ abstract public class VertexAttachment extends Attachment {
 	static private int nextID;
 
 	private final int id = nextID();
-	@Null Attachment timelineAttachment = this;
 	@Null int[] bones;
 	float[] vertices;
 	int worldVerticesLength;
@@ -58,7 +57,6 @@ abstract public class VertexAttachment extends Attachment {
 	/** Copy constructor. */
 	public VertexAttachment (VertexAttachment other) {
 		super(other);
-		timelineAttachment = other.timelineAttachment;
 
 		if (other.bones != null) {
 			bones = new int[other.bones.length];
@@ -177,17 +175,6 @@ abstract public class VertexAttachment extends Attachment {
 		this.worldVerticesLength = worldVerticesLength;
 	}
 
-	/** Timelines for the timeline attachment are also applied to this attachment.
-	 * @return May be null if no attachment-specific timelines should be applied. */
-	public @Null Attachment getTimelineAttachment () {
-		return timelineAttachment;
-	}
-
-	/** @param timelineAttachment May be null if no attachment-specific timelines should be applied. */
-	public void setTimelineAttachment (Attachment timelineAttachment) {
-		this.timelineAttachment = timelineAttachment;
-	}
-
 	/** Returns a unique ID for this attachment. */
 	public int getId () {
 		return id;