I periodically observe that when I round-trip from Lightroom Classic to process an image in a plugin, Lightroom changes the sort order from Filename order to Custom order when the round trip is complete. This is undesirable for a couple of reasons. First, you don't see the result in Lightroom, because it's sorted off-screen. Second, I like to use the Stacking feature to keep the results with the source photos. So, for example, an HDR image would be stacked on top of the source photos it was made from. This is happening in conjunction with several plugins, including Photomatix, Landscape Pro, and the NIK Suite. Are you aware of this issue? Is there a fix or work-around?