Answered
Photoshop 23.4.1 doing select/copy/file-new clipboard-size (width & Height) is incorrect
You actually have to select a different preset detail, then when you select 'clipboard' the width and height get corrected.
You actually have to select a different preset detail, then when you select 'clipboard' the width and height get corrected.
Hi @BRNBRN please tick the box Use Legacy "New Document" Interface, did that fix your issue?

Thank you,
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