Stacked bar plot is broken in hvplot 0.11.0

[mosc9575]

In the latest version of hvplot plotting stacked bars from a DataFrame with multiple columns is broken.

See the second example in the latest docs.

minimal example

from hvplot.sample_data import us_crime

crime = us_crime.read()
print(type(crime))
crime.head()

crime.hvplot.bar(x='Year', y=['Violent crime total', 'Property crime total'],
                 stacked=True, rot=90, width=800, legend='top_left')

I y is a string and not a list, the bar plot works!