diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs
index 269a777c0..769860926 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs	
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs	
@@ -1230,9 +1230,11 @@ namespace Spine.Unity {
 			// Zero the extra.
 			{
 				int listCount = vertexBuffer.Count;
-				Vector3 vector3zero = Vector3.zero;
+				// unfortunately even non-indexed vertices are still used by Unity's bounds computation,
+				// (considered a Unity bug), thus avoid Vector3.zero and use last vertex instead.
+				Vector3 extraVertex = listCount == 0 ? Vector3.zero : vbi[listCount - 1];
 				for (int i = listCount; i < vbiLength; i++)
-					vbi[i] = vector3zero;
+					vbi[i] = extraVertex;
 			}
 
 			// Set the vertex buffer.
diff --git a/spine-unity/Assets/Spine/package.json b/spine-unity/Assets/Spine/package.json
index 3662eab62..39185bfda 100644
--- a/spine-unity/Assets/Spine/package.json
+++ b/spine-unity/Assets/Spine/package.json
@@ -2,7 +2,7 @@
 	"name": "com.esotericsoftware.spine.spine-unity",
 	"displayName": "spine-unity Runtime",
 	"description": "This plugin provides the spine-unity runtime core.",
-	"version": "4.2.89",
+	"version": "4.2.90",
 	"unity": "2018.3",
 	"author": {
 		"name": "Esoteric Software",