Z-wave restore last value doesn't work for Fibaro FGD-211 dimmer

I have a Fibaro Dimmer configured with the setting “Restore Last Dimming level on ON.” (As seen in PaperUI and HABmin Things configuration)

I configured two items: a switch and a dimmer:

Switch SL_keuken “Switch lamp keuken” (gKeuken) { channel = “zwave:device:ff125853:node3:switch_dimmer” }

Dimmer DL_keuken “Dimmer lamp keuken [%d %%]” (gKeuken) { channel = “zwave:device:ff125853:node3:switch_dimmer” }

When I press the physical switch connected to the FGD-module the light switches on at the last used value and the status of the switch and slider at the sitemap changes accordingly:
switch -> On Slider ->
This works as expected.

When I switch on the light by acitvating the switch at the sitemap, the light switches on at the last used level. The slider however shows 100% instead of the actual level.

Is this a BUG, or can this be changed by a parameter?