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

首先运行 issue 中提供的两个 R plot_ly mesh3d 示例，并比较有无 facecolor 时等高线的移动情况和顶点坐标。跟踪 3D tri-surf 渲染路径以确定差异，并在 facecolor 不再导致等高线位置或坐标错误时将 issue 视为完成。