Sankey diagram: position of node cannot be rendered correctly

Bắt đầu với mã R có thể tái lập trong issue và chạy mã đó bằng Plotly 4.10.3 để xác nhận cách Sankey arrangement="snap" xử lý các vị trí x và y được cung cấp. Điều tra hành vi kết xuất Sankey đối với các nút 13–16, sau đó xác minh rằng các nút 13, 14, 15 và 16 vẫn nằm trong cùng một cột tại x=0.999.

Hello people!
I am trying to make a sankey diagram with Plotly, however, the alignment of certain node cannot be rendered correctly as I set.
PS: my Plotly version is 4.10.3 and R version is 4.3.1

Here is my code:

library("plotly")

# My data base
values <- c(10,1811,530,363,271,601,681,37,46,18,109,39,3,22,74,22,10,
            14,3,81,0,1,19,1807,521,363,270,601,16,36,8,46,86,1,0,0,23,
            14,18,34,684,23,0,16,0,23,0,0,0,23,14,18,69,1,34,0,0,0,684,
            43,643,101,6,68,43,620,101,6,19,1807,521,363,270,601,16,36,
            8,46,15,1555,79,244,346,4,115,2,2,0,4,17,251,265,1,3,25,3,
            16,0,8,43,105,24,2,1,1,6,0,601,0,129,196,109,14,82,124,1,
            34,2,0,13,0,11)
target <- c(2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,4,4,4,4,4,4,4,4,
            4,4,5,5,5,5,5,5,5,5,5,5,5,10,10,10,10,10,10,10,10,11,11,11,
            11,11,11,11,11,6,6,6,6,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,13,13,13,
            13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,15,15,
            15,15,15,15,15,15,16,16,16,16,16,16,16,16,16,16,9,9,9,9)
source <- c(0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,
            2,2,2,2,2,2,2,2,2,2,2,6,6,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,10,
            11,11,11,6,6,6,6,6,4,4,4,4,4,4,4,4,4,4,8,8,8,8,8,8,8,8,8,8,
            8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8)

num_node <- c(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16)
x_position <- c(0.05,0.05,0.2,0.35,0.35,0.35,0.65,0.8,0.8,0.9,0.45,0.45,0.45,0.999,0.999,0.999,0.999)
y_position <- c(0.45,0.6,0.55,0.15,0.45,0.6,0.75,0.85,0.55,0.99,0.6,0.6,0.6,0.3,0.3,0.3,0.3)

# Sankey diagram with Plotly
fig <- plot_ly(
  type = "sankey",
  arrangement = "snap",
  node = list(
    label = num_node,
    x = x_position,
    y = y_position,
    pad = 15,
    thickness = 15
  ),
  link = list(
    source = source,
    target = target,
    value =  values
  )
)

fig

What I would expect is that node 13, 14, 15, 16 be at the same colomn, as I set their x position to 0.999. See picture below:

However, for some reason, my node 13 would like to be in the middle of my diagram instead of the position where it should have been. See picture below:

Does anyone have some insights why the node cannot accept x and y position I set? Thank you guys very much!