Buffer visualizations rendered in HDR through the high res screenshot tool or sequencer using DX12 and r.postprocessingcolorformat 1 will result in renders that only capture the first row of pixels.
The base screenshot renders correctly, but all buffer visualizations are just the first row of pixels repeated.
The buffer visualizations should match their in-editor appearance. Using the high res screenshot tool without r.postprocessingcolorformat 1 will give the correct results as well.
This effects sequences rendered with custom render passes in HDR as well.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-77363 in the post.