Unexpected point geometries on geom_livemap()

[IKupriyanov-HORIS]

geom_livemap() should not render points if data and mappings provided by ggplot() function but symbol parameter is not set.

x = []
y = []
z = []
for i in range(-10, 10):
    for j in range(-10, 10):
        x.append(i)
        y.append(j)
        z.append(i - j)
d = {
    'x': x, 
    'y': y, 
    'z': z
}
ggplot(d, aes('x', 'y', fill='z')) + geom_livemap() + geom_tile(alpha=.7)