Render to texture not working in Preview mode but working in Editor

Development World Creation
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2

I got the render to texture working. I had assigned the render target texture directly to the widget which was why it was not working correctly.

Now I have set it up correctly I think but I get pixelated image. This is what I see

simple_render_to_texture_dice
simple_render_to_texture_dice1920×1080 129 KB

This is how I have the blueprint scene component setup

simple_render_to_texture_dice_bp_viewport
simple_render_to_texture_dice_bp_viewport1247×636 256 KB

My material is setup the following way :-

simple_render_to_texture_dice_material
simple_render_to_texture_dice_material1400×778 105 KB

Is there any mistake here. It is extremely pixelated when I make a build and run it.