Pipeline spinner transition not showing when served by bokeh server

[xavArtley]

import panel as pn
import param
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(pn.Column(self.param, pn.Spacer(height=300)), 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):
        import time
        time.sleep(10)
        return pn.Row(pn.Column(self.param, pn.Spacer(height=300)), self.view)
    

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

pipeline = pn.pipeline.Pipeline(stages)
pipeline.layout

when running this code in notebook, spinner appear when changing stage

However when using
pipeline.layout.show()

spinner does not appear