In lxqt-labwc,show desktop widget didn't work , Is this normal?

[knm100]

show desktop is work fine in lxqt-kwin. not in lxqt-labwc.
The icon is also incorrect in lxqt-labwc.

[stefonarch]

→ https://github.com/stefonarch/LXQt-Wayland-files/blob/main/lxqt-panel.md#show-desktop-button