tickmode='sync' option is not working as expected

I was trying to use the multi-axes functionality in Plotly with the tickmode='sync' option, but the result was not as I expected. The grid axes are not aligned at y = 0 and the ticks of the second y axis are not "nice" rounded numbers. I found out that this issue was already raised in the repository where the functionality was originally pulled from: https://github.com/VictorBezak/Plotly_Multi-Axes_Gridlines/issues/4. Unfortunately, it was never resolved and since it is incorporated in Plotly I think it would make more sense to raise the issue here. Hopefully, someone can help me out!

P.S.: I think issue https://github.com/plotly/plotly.py/issues/4351 is referring to the same problems, but it is not as nicely explained as the issue mentioned above.

まず、tickmode='sync' を使用した複数軸のケースを再現し、リンクされている upstream issue および plotly.py issue #4351 と動作を比較します。グリッド軸が y = 0 で揃い、2 番目の y 軸が見やすく丸められた tick 値を使用すれば完了です。