I was able to fix it with hv.extension('matplotlib') instead of hv.extension('bokeh' ,'matplotlib').
And then hv.save(hv_imt.opts(colorbar=True, fig_size=500, cmap='seismic', clim=(-10**-3, 10**-3)), fmt="gif", backend="matplotlib", filename="test3", fps=1), without needing to render.
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