SUMMARY
If both menubar and titlebar are hidden, hamburger menu at the bottom left corner is broken and will freeze Haruna when pressed.

STEPS TO REPRODUCE
1. Install Haruna 1.0.1 from flathub
2. Open Haruna (even without video)
3. Press Ctrl+M to hide menubar and Ctrl+H to hide titlebar
4. Try to open hamburger menu at the bottom left corner

OBSERVED RESULT
Haruna freezes.

EXPECTED RESULT
Hamburger menu at the bottom left corner should open normally.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Kubuntu 22.04/Plasma 5.24.7 (but Haruna from flathub)
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
If I only hide menubar (Ctrl+M) and keep titlebar, then hamburger menu at the top left corner in titlebar works normally.