Shape Layer example not working for layer='between' and yref='y domain'

Hi! Since latest plotly version 5.21 a great addition has been considered by @my-tien pull #6927 being capable of specifying shape layer as 'between' which should solve issues such as presented in https://github.com/plotly/plotly.js/issues/4106.

Example shown in https://plotly.com/python/shapes/ section Shape Layer works fine as it is, but it is not producing expected results when specifying yref='y domain' for the layer='between' subplot. As a mre, the following code:

import plotly.express as px

df = px.data.stocks(indexed=True)

fig = px.line(df)

fig.add_shape(
    type="rect",
    x0="2018-03-01",
    y0=0,
    x1="2018-08-01",
    y1=3,
    line_width=0,
    layer="above",
    label=dict(text="Above", textposition="top center", font=dict(size=15)),
    fillcolor="LightGreen",
    opacity=0.80,
)

fig.add_shape(
    type="rect",
    x0="2018-10-01",
    y0=0,
    x1="2019-03-01",
    y1=3,
    yref='y domain',  # consider y domain
    line_width=0,
    layer="between",
    label=dict(text="Between", textposition="top center", font=dict(size=15)),
    fillcolor="LightGreen",
    opacity=0.80,
)

fig.add_shape(
    type="rect",
    x0="2019-05-01",
    y0=0,
    x1="2019-10-01",
    y1=3,
    line_width=0,
    layer="below",
    label=dict(text="Below", textposition="top center", font=dict(size=15)),
    fillcolor="LightGreen",
    opacity=0.80,
)

fig.show()

Produces this unexpected figure:

首先运行 Plotly 文档 Shape Layer 部分提供的 Python 重现代码，并比较 yref='y domain' 与 layer='between' 时的结果。跟踪 fig.add_shape 如何将这些设置传递到 Plotly.js 的 shape 渲染路径，然后验证 between 层的矩形是否按预期定位和渲染。