STEPS TO REPRODUCE 1. Install Dolphin from Flathub, and uninstall it from distro repos 2. Launch the Flatpak Dolphin 3. Configure > Interface > Folders & Tabs > Check the checkbox for "Keep a single Dolphin window, opening new folders in tabs" 4. Close the config window, but keep the main window open 5. Launch Kate and open a file 5. File > File Actions > Open Containing Folder OBSERVED RESULT The folder opens in a new Dolphin instance EXPECTED RESULT The folder opens in a new tab of the existing Dolphin instance SOFTWARE/OS VERSIONS Operating System: KDE Linux 2025-08-01 KDE Plasma Version: 6.4.80 KDE Frameworks Version: 6.17.0 Qt Version: 6.9.1 Kernel Version: 6.15.8-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ Ultra 5 226V Memory: 16 GiB of RAM (15.1 GiB usable) Graphics Processor: Intel® Graphics