Cell expansion not working consistently in Grid Nested Data Binding Sample

1. Open the sample above `Working with Flat data` title in this page https://staging.infragistics.com/products/ignite-ui-angular/angular/components/grid/grid#working-with-flat-data
2. Click on `Rachael Adams cell` or `Diana Foster` and observer the result 

<img width="1894" height="936" alt="Image" src="https://github.com/user-attachments/assets/b82bedec-d3bc-45a3-b2c6-3910eeb0c724" />