off event for highlighting not firing for 3d marker/scatter3d

[brooksambrose]

I have not found a way to deselect highlighted markers in 3d. No off events appear to work when z coordinates are specified with add_markers.

library(plotly)
    d<-data.frame(x=rnorm(10),y=rnorm(10),z=rnorm(10),grp=sample(1:2,10,T),clr=rnorm(10)) %>% highlight_key(~grp)
    # off event fires as expected
    plot_ly(d) %>%
        add_markers(x=~x,y=~y,text=~grp,hoverinfo='text',color=~clr) %>%
        highlight(on='plotly_click',off='plotly_doubleclick')

    # no off event fires
    plot_ly(d) %>%
        add_markers(x=~x,y=~y,z=~z,text=~grp,hoverinfo='text',color=~clr) %>%
        highlight(on='plotly_click',off='plotly_doubleclick')

Looping gif makes it look like it's deselecting, but it's not.