It looks like we never generated correct icon previews for images with float_rects (non-8bit-images). Images from the report were 16bit pngs. In this case, `icon_preview_startjob` would return early (it only checked if the ImBuf `rect` was NULL -- which is the case if it has a `rect_float` instead). This is not neccessary since `icon_copy_rect` is perfectly capable of taking float rects. Now correct the check and only return early if both `rect` & `rect_float` are NULL. note: this will not refresh icon previews from existing files automatically. For this, use File > Data Previews > Clear Data-Block Previews. Maniphest Tasks: T86210 Differential Revision: https://developer.blender.org/D10601
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