A bug report would be immaterial. The change was deliberate with F38 release and I don’t believe it will be reversed. That linked discussion has several methods to turn off the auto-suspend issue that users are welcome to use.
I believe the decision was based on an attempt to make the OS more eco-friendly by reducing power demands overall.
I am not sure about kinoite or silverblue, but as I understood it the change affected all the various spins but the fedora server release – regardless of the desktop involved. If kinoite or silverblue was not involved then that is news to me.
Applications my inhibit suspend using systemd-inhibit. It would be reasonable for Dolphin to inhibit suspend while a file copy is running for example and then lift that inhibit when it’s completed.