rasterize with opts raises warning in latest dev release

[hoxbro]

ALL software version info

datashader : 0.14.0
holoviews  : 1.15.0a2

Description of expected behavior and the observed behavior

The combination of rasterize and using opts will give a warning with the latest dev release of holoviews. The warning is not present with version 1.14. The warning is only present with rasterize and not without it.

It seems the warning is only coming from this function:

holoviews/holoviews/core/spaces.py

Lines 460 to 468 in 83ee181

	def _style(self, retval):
	"""
	Use any applicable OptionTree of the DynamicMap to apply options
	to the return values of the callback.
	"""
	if self.id not in Store.custom_options():
	return retval
	spec = StoreOptions.tree_to_dict(Store.custom_options()[self.id])
	return retval(spec)

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

import holoviews as hv
from holoviews.operation.datashader import rasterize
hv.extension("bokeh")

plot = rasterize(hv.Curve(range(10)))
(plot + plot).opts(shared_axes=False)

Screenshots or screencasts of the bug in action

With holoviews 1.15:

With holoviews 1.14:

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