When I have an image conversion preset and modify it, a "modified" label is added in the preset selection field. However, when I close that dialog box and reopen it, the modified preset value is saved, but the "modified" label is no longer there. This changes when I, for example, place and click the cursor in the quality settings, and then select the presets list, then, the "modified" label is displayed.
I would expect the "modified" label to remain from the first moment I open the image conversion dialog box, if there's any value that's different compared to the default ones of that preset.