Legends of geom_map mistake between `size` and `stroke`, and do not obey `shape`

When using geom_map to plot points on a map, the figure panel itself looks perfectly correct. However, the legend seems to mistake the size with the stroke argument. Also, the legend always uses squares for the shape, no matter what value is passed to the shape argument

Here is an example:

import pandas as pd
import geopandas as gpd
import plotnine as p9

df = pd.DataFrame({"x": [0, 1, 2], "y": [2, 1, 0], "group": ["A", "B", "A"]})
geo_df = gpd.GeoDataFrame(df, geometry=gpd.points_from_xy(df.x, df.y))

# Create a plot using geom_map
(
    p9.ggplot(geo_df)
    + p9.geom_map(p9.aes(fill="group"), size=4, stroke=0.5, shape="v")
    + p9.labs(title="Plotted by geom_map")
)

# Create a plot using geom_point (for comparison)
(
    p9.ggplot(df)
    + p9.geom_point(p9.aes(x="x", y="y", fill="group"), size=4, stroke=0.5, shape="v")
    + p9.labs(title="Plotted by geom_point")
)