`.last()` can't be used on LazyGroupBy about polars HOT 2 CLOSED

(lf.group_by_dynamic("time", every="1h", closed="right")
   .last()
   .collect()
)
# DuplicateError: column with name 'time' has more than one occurrences

(lf.group_by_dynamic("time", every="1h", closed="right")
   .agg(pl.all().last())
   .collect()
)
# DuplicateError: column with name 'time' has more than one occurrences

(lf.group_by_dynamic("time", every="1h", closed="right")
   .agg(pl.exclude("time").last())
   .collect()
)

# shape: (4, 3)
# ┌─────────────────────┬─────┬─────┐
# │ time                ┆ n   ┆ m   │
# │ ---                 ┆ --- ┆ --- │
# │ datetime[μs]        ┆ i64 ┆ i64 │
# ╞═════════════════════╪═════╪═════╡
# │ 2021-12-15 23:00:00 ┆ 0   ┆ 0   │
# │ 2021-12-16 00:00:00 ┆ 2   ┆ 2   │
# │ 2021-12-16 01:00:00 ┆ 4   ┆ 4   │
# │ 2021-12-16 02:00:00 ┆ 6   ┆ 6   │
# └─────────────────────┴─────┴─────┘