Set attachmentVerticesCount to zero.

spine-c/src/spine/Slot.c

@@ -51,11 +51,12 @@ void spSlot_dispose (spSlot* self) {
 
 void spSlot_setAttachment (spSlot* self, spAttachment* attachment) {
 	CONST_CAST(spAttachment*, self->attachment) = attachment;
-	SUB_CAST(_spSlot, self) ->attachmentTime = self->bone->skeleton->time;
+	SUB_CAST(_spSlot, self)->attachmentTime = self->bone->skeleton->time;
+	self->attachmentVerticesCount = 0;
 }
 
 void spSlot_setAttachmentTime (spSlot* self, float time) {
-	SUB_CAST(_spSlot, self) ->attachmentTime = self->bone->skeleton->time - time;
+	SUB_CAST(_spSlot, self)->attachmentTime = self->bone->skeleton->time - time;
 }
 
 float spSlot_getAttachmentTime (const spSlot* self) {
@@ -64,6 +65,7 @@ float spSlot_getAttachmentTime (const spSlot* self) {
 
 void spSlot_setToSetupPose (spSlot* self) {
 	spAttachment* attachment = 0;
+
 	self->r = self->data->r;
 	self->g = self->data->g;
 	self->b = self->data->b;

spine-libgdx/src/com/esotericsoftware/spine/Slot.java

@@ -119,7 +119,6 @@ public class Slot {
 	void setToSetupPose (int slotIndex) {
 		color.set(data.color);
 		setAttachment(data.attachmentName == null ? null : bone.skeleton.getAttachment(slotIndex, data.attachmentName));
-		attachmentVertices.clear();
 	}
 
 	public void setToSetupPose () {