When multiple versions of the same frame are generated (like EXR and JPG), always report the most web-preview-friendly version. In other words, when the frames are produces by Blender in the order (`frame-001.jpg`, `frame-001.exr`), only the JPEG is reported. When the JPEG follows the EXR, both will be reported as when the EXR is created it is not yet know whether it will be followed by a JPEG or not. Before this, the 2nd file would never be reported due to the Worker throttling such reports to the Manager (to not swamp it when rendering sequences of images, for example).