Some programs such as web browsers offer an option to show a file in the default file manager – for example, in Vivaldi browser, after a file is downloaded, there’s a right-click option “Show in File Manager”, which launch the file manager in the folder that contains the file. In other file managers such as MS Window’s, it would launch the file manager with the desired file already pre-selected and the scroll focus already shifted so as to make the file visible. Would be nice if Dolphin could also offer this same behavior for software that offers this functionality.
This functionality is already available, it's just up to apps to use the correct API. You can see this feature working properly if you click the "Open Containing Folder" menu item in many KDE apps, for example: Dolphin opens and the item is pre-selected. The bug is on the affected apps, not Dolphin. Please report to their developers. Thanks!