Hover on plotly TriSurface shows wrong values

Hi,
when I hover over

import numpy as np
import holoviews as hv
hv.extension('plotly')
y,x = np.mgrid[-5:5, -5:5] * 0.2 
heights = np.sin(x**2+y**2) * 10

trisurface = hv.TriSurface((x.flat,y.flat,heights.flat)) 

trisurface.opts(height=500, width=500)

the values shown in the popup are wrong. Is this a bug or do I something wrong? ( How can I make a screenshot with a popup opened?)
Thanks