HeatMapRenderMethod.Bitmap issue

in Blazor server we application, if  RenderMethod = HeatMapRenderMethod.Rectangles then, polting is working fine. but, if  RenderMethod = HeatMapRenderMethod.Rectangles then, data is there,we can't see it,
plot will be blank,

<img width="832" height="518" alt="Image" src="https://github.com/user-attachments/assets/6960f9cf-d187-4143-9ff6-7c99c377b755" />