Python sort syntax with as_list is not functioning

[chipkent]

Problems when using the sort syntax with as_list

from deephaven.TableTools import newTable, stringCol, intCol, doubleCol
from deephaven import SortColumn, as_list
from deephaven.TableManipulation import ColumnName

source = newTable(
    stringCol("Letter", "A", "B", "A", "B", "B", "A"),
    intCol("Number", 6, 6, 1, 3, 4, 4),
    stringCol("Color", "red", "blue", "orange", "purple", "yellow", "pink")
)

sort_columns = as_list([
    SortColumn.asc(ColumnName.of("B")),
    SortColumn.desc(ColumnName.of("C"))
])

r-Scheduler-Serial-1 | i.d.g.s.SessionState      | Internal Error '026de2e4-f4ab-469a-8f46-fe63c05316ca' java.lang.RuntimeException: Error in Python interpreter:
Type: <class 'ValueError'>
Value: The data for unknown was inferred to have appropriate intermediate type `io.deephaven.api.SortColumn`, which was unhandled in the conversion.
Line: 455
Namespace: _failedToConvertArray
File: /usr/local/lib/python3.7/dist-packages/deephaven/conversion_utils.py