Incorrectly scaled final color buffer when Upscaling is not active

Steps to reproduce:

1. Enter playmode
2. Left click the mouse multiple times. There is a script on the camera that will reduce the resolution scaling by 10% each click. 

Actual results: Each time you left click, a new smaller image is generated and applied on top of the previous one.

Expected results: Each time you left click, the image becomes more pixelated

Reproducible with versions: 6000.6.0a1, 6000.6.0a2 

Not reproducible with versions: 6000.5.0a7

Note:

• I have tested builtin and it still works fine, so likely URP specific. Have not tested HDRP.
• Only tested windows DX12
• Reproduces only when resizing buffers via ScalableBufferManager and Render Scale is set to <1 eg no Upscaling filters are active.