increaseVertices preserves updatable option

src/Meshes/mesh.ts

@@ -2587,7 +2587,7 @@ export class Mesh extends AbstractMesh implements IGetSetVerticesData {
             }
 
             vertex_data.indices = indices;
-            vertex_data.applyToMesh(this);
+            vertex_data.applyToMesh(this, this.isVertexBufferUpdatable(VertexBuffer.PositionKind));
         }
     }