The visualization rendered depends on the active render at plot creation

I'm on hvplot==0.9.1, holoviews==1.18.1, trying to communicate to the world that hvPlot now works with Polars.

To my surprice I cannot **create and render independently** to any of the backends. I must recreate and render the plot.

I believe that it must be a fundamental principle that I can create the plot objects and render independently. Anything else does not make sense in my world. Otherwise I can't reuse a plot for different use cases.

## Does not work if I create plot once


## Works when I create plots again


## Code

```python
import polars as pl
import hvplot.polars

df = pl.read_csv("Christmas tree sales 2004-2016.csv")
df = df.with_columns(pl.col("total_trees_sold")/10**6)
plot = df.hvplot.bar(x="Year", y="total_trees_sold", title="Christmas Trees sold by year", color="red", ylabel="Trees Sold in millions", height=200, width=1200)

hvplot.extension("bokeh")
plot

hvplot.extension("matplotlib")
plot

hvplot.extension("plotly")
plot
```

[Christmas tree sales 2004-2016.csv](https://github.com/holoviz/hvplot/files/13758344/Christmas.tree.sales.2004-2016.csv)