Can't display pipeline layout two times

[xavArtley]

To reproduce the error I just done the user guide notebook:
https://panel.pyviz.org/user_guide/Pipelines.html

import param
import panel as pn
import holoviews as hv

pn.extension()

class Stage1(param.Parameterized):
    
    a = param.Number(default=5, bounds=(0, 10))

    b = param.Number(default=5, bounds=(0, 10))
    
    @param.output(c=param.Number)
    def output(self):
        return self.a * self.b
    
    @param.depends('a', 'b')
    def view(self):
        return pn.pane.LaTeX('$%s * %s = %s$' % (self.a, self.b, self.output()))

    def panel(self):
        return pn.Row(self.param, self.view)

class Stage2(param.Parameterized):
    
    c = param.Number(default=5, precedence=-1, bounds=(0, None))

    exp = param.Number(default=0.1, bounds=(0, 3))
    
    @param.depends('c', 'exp')
    def view(self):
        return pn.pane.LaTeX('${%s}^{%s}={%.3f}$' % (self.c, self.exp, self.c**self.exp))

    def panel(self):
        return pn.Row(self.param, self.view)

stages = [
    ('Stage 1', Stage1),
    ('Stage 2', Stage2)
]

pipeline = pn.pipeline.Pipeline(stages)

First display is ok :

However second one:

.