isort generates code with syntax errors with profile=black and multi_line_output=2

[matthew-hodgins]

isort version 5.12.0
Python version: 3.9.2

In the following example:

pyproject.toml

[tool.isort]
py_version=39
profile="black"
multi_line_output=2
line_length=50
force_alphabetical_sort_within_sections=true

test.py:

from datetime import datetime, time, timedelta, timezone, tzinfo

isort will generate code with a syntax error (the trailing comma after the last import):

from datetime import datetime, time, timedelta, \
   timezone, tzinfo,

If I remove profile = "black" from the pyproject.toml file, the trailing comma is not present.