jslink sometimes ignores key value pairs

[johanneselbs]

ALL software version info (Panel, bokeh, python, notebook, OS, browser, any other relevant packages)

Tested on 2 of my conda envs:

panel: 0.6.0 / 0.6.2
bokeh: 1.3.4
python: 3.6.6 / 3.7.3
holoviews: 1.12.3
notebook: 6.0.0
IPython: 7.7.0/7.1.1
browser: firefox 68.0.2

Description of expected behavior and the observed behavior

Using jslink with two links in the same command, only the first one has an effect. In this case only the lower color_mapper follows the zooming of distr:

distr.jslink(image, **{'x_range.start': 'color_mapper.low', 'x_range.end': 'color_mapper.high'})

Seperating on two lines, behaviour is as expected:

distr.jslink(image, **{'x_range.start': 'color_mapper.low'})
distr.jslink(image, **{'x_range.end': 'color_mapper.high'})

Complete, minimal, self-contained example code that reproduces the issue

import holoviews as hv
from scipy import stats
import numpy as np
import panel as pn

hv.extension('bokeh')

xvals  = np.linspace(-4, 0, 202)
yvals  = np.linspace(4, 0, 202)
xs, ys = np.meshgrid(xvals, yvals)

alpha = 1
beta = 0
zs = np.sin(((ys/alpha)**alpha+beta)*xs)

image = hv.Image(zs, vdims='values')

xd = zs.flatten()
xd.sort()
yd = stats.norm.ppf(np.arange(1, len(xd)+1) / (len(xd) + 1))

distr = pn.panel(hv.Curve((xd, yd), kdims='values', vdims='sigma'))

# Not working:
distr.jslink(image, **{'x_range.start': 'color_mapper.low', 'x_range.end': 'color_mapper.high'})

# Working example:
# distr.jslink(image, **{'x_range.start': 'color_mapper.low'})
# distr.jslink(image, **{'x_range.end': 'color_mapper.high'})

pn.Row(image, distr)

Stack traceback and/or browser JavaScript console output

No error message, just not working as expected: when zoomin in the distribution window: color coding follows for the lower side, but not on the upper side.

Screenshots or screencasts of the bug in action

Upload does not work :-(