Describe the bug

The Related Products block doesn't render the same result as the Classic Template when used on a Group Product.

In the Classic Template, it seems that nothing is rendered. We should check this logic.

To reproduce

Steps to reproduce the behavior:

1. Edit the Single Product Template.
2. Below the WooCommerce Single Product Block, add the Related Products block.
3. On the frontend side, click on a group product.
4. The products inside the Related Products block differ from the row generated by the WooCommerce Single Product Block.

Expected behavior

The result has to be the same.

Screenshots