hv.Spread on streams.Buffer

[wabu]

hv.Spread does behave strange on streams.Buffer, creating strange shapes, but not a real spread.
Here's a minimal example

buffer = hv.streams.Buffer(pd.DataFrame({'mean': [], 'std': []}))
hv.DynamicMap(hv.Spread, streams=[buffer])

buffer.send(pd.DataFrame({'mean': [1, 2, 1, 4], 'std': [.5, .2, .1, .5]}, index=[0,1,2,3]))

When plotting the buffers content, the correct spread is created:

hv.Spread(buffer.data)

Version: 1.10.7

[github-actions]

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