BUG: pandas.DataFrame.filter not outputting items/columns in the provided order on 2.1.0

[roboes]

Pandas version checks

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Reproducible Example

import pandas as pd

df = pd.DataFrame({"A": [1, 2, 3], "B": [4, 5, 6]})
df.filter(items=['B', 'A'])

Issue Description

Previously, .filter() would take into account the positional items/columns and output them accordingly; on version 2.1.0, it only filters the columns, keeping the original column order intact.

Expected Behavior

While running df.filter(items=['B', 'A'], axis=1), I would expect column B to be the first, but what happens is that the order does not change.

Installed Versions

INSTALLED VERSIONS

commit : ba1cccd
python : 3.11.5.final.0
python-bits : 64
OS : Windows
OS-release : 10
Version : 10.0.22621
machine : AMD64
processor : Intel64 Family 6 Model 142 Stepping 12, GenuineIntel
byteorder : little
LC_ALL : None
LANG : None
LOCALE : English_Germany.utf8

pandas : 2.1.0
numpy : 1.25.2
pytz : 2023.3
dateutil : 2.8.2
setuptools : 68.1.2
pip : 23.2.1
Cython : None
pytest : 7.4.1
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : 3.1.2
lxml.etree : 4.9.3
html5lib : 1.1
pymysql : None
psycopg2 : 2.9.7
jinja2 : 3.1.2
IPython : None
pandas_datareader : None
bs4 : 4.12.2
bottleneck : None
dataframe-api-compat: None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : 3.7.2
numba : None
numexpr : None
odfpy : None
openpyxl : 3.1.2
pandas_gbq : None
pyarrow : None
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : 1.11.2
sqlalchemy : 2.0.20
tables : None
tabulate : None
xarray : 2023.8.0
xlrd : 2.0.1
zstandard : 0.21.0
tzdata : 2023.3
qtpy : None
pyqt5 : None