Contour not shown correctly in 3D Tri-Surf Plots

When plotting the 3D tri-surf figure, if we don't specify the facecolor of the plot, the contour will work well.
However, if we specify the faceolor of each faces, the contour will be stuck in the middle can't move and the coordinate
of each vertex also doesn't show its correct x,y,z.
The examples in the tutorials also have this problem.
Not sure if there have other way to specifiy the facecolor without making these issues.
Thank you very much for your help!

fig <- plot_ly(type = 'mesh3d',
  x = c(0, 1, 2, 0),
  y = c(0, 0, 1, 2),
  z = c(0, 2, 0, 1),
  i = c(0, 0, 0, 1),
  j = c(1, 2, 3, 2),
  k = c(2, 3, 1, 3),
  opacity = 0.5,
  contour = list(show = TRUE, color="#000", width=15)
  #facecolor = toRGB(viridisLite::viridis(4))
)
fig

fig <- plot_ly(type = 'mesh3d',
  x = c(0, 1, 2, 0),
  y = c(0, 0, 1, 2),
  z = c(0, 2, 0, 1),
  i = c(0, 0, 0, 1),
  j = c(1, 2, 3, 2),
  k = c(2, 3, 1, 3),
  opacity = 0.5,
  contour = list(show = TRUE, color="#000", width=15),
  facecolor = toRGB(viridisLite::viridis(4))
)
fig

Inizia eseguendo i due esempi R plot_ly mesh3d forniti nell’issue e confronta lo spostamento del contorno e le coordinate dei vertici con e senza facecolor. Segui il percorso di rendering 3D tri-surf per identificare la differenza e considera conclusa l’issue quando facecolor non causa più un posizionamento errato del contorno o coordinate errate.