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.

首先复现使用 tickmode='sync' 的多轴案例，然后将其行为与链接的上游 issue 以及 plotly.py issue #4351 进行比较。当网格轴在 y = 0 处对齐，并且第二个 y 轴使用规整、经过舍入的 tick 值时，即表示完成。