Visual bug for nodes with fixed position in Sankey plot

There seems to be a visual bug for nodes with fixed positions that makes it hard to differentiate between incomming and outgoing links.
It would be great if this would be solves the same way it is solved with loops. In my example the left side that has no loop therefore would likely be read as a link from node B to A. The right side however has a loop and solves the issue by implementing a visual that shows clearly that the link from node D to C is outgoing at D terefore on the right side and incomming at C therefore on the left side.

  fig = go.Figure(data=[go.Sankey(
      arrangement="snap",
      node=dict(
          label=["A", "B", "C", "D", "E", "F", "G", "H"],
          x=[0.3, 0.4, 0.6, 0.7],
          y=[0.5, 0.5, 0.5, 0.5]
      ),
      link=dict(
          source=[1, 2, 3],
          target=[0, 3, 2],
          value=[1, 1, 1]
      ))])
  fig.show()

首先运行提供的 Python Sankey 复现，并将固定位置的链接与示例中显示的循环渲染进行比较。跟踪 Sankey 渲染入口点，并确定链接方向在每个节点上是如何传递的；完成的标准是：在所报告的布局中，传入链接和传出链接能够在视觉上区分，同时不导致循环渲染回归。