Crashing when workspace switcher active & move window(s) to another workspace on hyprland.

Hello, I'm using xfce4-panel on hyprland and it works good, until I need to move / send window(s) to another workspace. Xfce4-panel would crash immediately. The crash didn't happen if I I disable the workspace switcher plugin. I'm trying to investigate it using gdb and I have backtrace(s). hyprxfce.log hyprxfce-full.log

• Distro : Linux From Scratch Musl.
• Xfce4-panel : 4.21
• Compositor : Hyprland 0.51.1 commit 71a1216abcc7031776630a6d88f105605c4dc1c9