.shift() inside .replace() PanicException

[cmdlineluser]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

import polars as pl

df = pl.DataFrame({"x": [1, 2, 3]})

df.select(
    pl.lit(None).replace(None, pl.col("x").shift())
)

# thread '<unnamed>' panicked at crates/polars-core/src/series/iterator.rs:88:9:
# assertion `left == right` failed: impl error
#  left: 2
# right: 1

Log output

No response

Issue description

I was just experimenting with syntax, there was no real use case.

It seems to be specific to pl.lit(None)

With pl.lit(1) it gives the appropriate error instead.

# InvalidOperationError: `new` input for `replace` must have the same length as `old` or have length 1

Expected behavior

Error instead of panic.

Installed versions

main