No hover data on Segments

[Skealz]

Bug report on hover of Segments element

Software version info

python 3.7.4
holoviews 1.13.0
bokeh 2.0.0

Description of expected behavior and the observed behavior

When hovering Segments elements, the shown hover tooltip should contain data.
Instead, "???" are shown for every field.

Complete, minimal, self-contained example code that reproduces the issue
This is the code from http://build.holoviews.org/reference/elements/bokeh/Segments.html with just tools=["hover"] added.

import numpy as np
import holoviews as hv
from holoviews import dim
hv.extension('bokeh')

event = ['A', 'B']
data = dict(
    start=[np.datetime64('1999'), np.datetime64('2001')],
    end=[np.datetime64('2010'), np.datetime64('2020')],
    start_event = event,
    end_event = event
)

seg = hv.Segments(data, [hv.Dimension('start', label='Year'), 
                         hv.Dimension('start_event', label='Event'), 'end', 'end_event']).opts(tools=["hover"])

Screenshots or screencasts of the bug in action

[github-actions]

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