SUMMARY Meta key doesn't open application launcher. STEPS TO REPRODUCE 1. Add application launcher to latte dock 2. Edit shortcut of the launcher to use the meta key 3. Press the meta key and observe OBSERVED RESULT Application launcher doesn't open. EXPECTED RESULT Application launcher should open. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.24.0 KDE Frameworks Version: 5.90.0 Qt Version: 5.15.2 Kernel Version: 5.16.7-zen1-1-zen (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ i5-9300H CPU @ 2.40GHz Memory: 7.6 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics 630
Your step 2 is not needed with Latte. To enable this right click Dock, Configure Latte..., Enable option to press meta to show application launcher.