BUG: Regression in pandas 1.2.3 in dataframe.__setitem__
- [x] I have checked that this issue has not already been reported.

- [x] I have confirmed this bug exists on the latest version of pandas.

- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.

---



#### Code Sample, a copy-pastable example

```python
>>> import pandas as pd
>>> pd.__version__
'1.2.3'
>>> df = pd.DataFrame({"a": [1, 2, 3]})
>>> df[[True, False, True]] = pd.DataFrame({"a": [-1, -2]})
>>> df
     a
0 -1.0
1  2.0
2  NaN
```

Whereas this was fixed in `1.2.2`:

```python
>>> import pandas as pd
>>> pd.__version__
'1.2.2'
>>> df = pd.DataFrame({"a": [1, 2, 3]})
>>> df[[True, False, True]] = pd.DataFrame({"a": [-1, -2]})
>>> df
   a
0 -1
1  2
2 -2
```

#### Problem description

Setting a column based on boolean values seems to be broken in `1.2.3`. This previously was broken and fixed in `1.2.2`.


#### Expected Output

```python
>>> import pandas as pd
>>> df = pd.DataFrame({"a": [1, 2, 3]})
>>> df[[True, False, True]] = pd.DataFrame({"a": [-1, -2]})
>>> df
   a
0 -1
1  2
2 -2
```

#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS
------------------
commit           : f2c8480af2f25efdbd803218b9d87980f416563e
python           : 3.7.3.final.0
python-bits      : 64
OS               : Darwin
OS-release       : 20.3.0
Version          : Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64
machine          : x86_64
processor        : i386
byteorder        : little
LC_ALL           : None
LANG             : None
LOCALE           : en_US.UTF-8
pandas           : 1.2.3
numpy            : 1.19.2
pytz             : 2020.1
dateutil         : 2.8.1
pip              : 20.2.3
setuptools       : 50.3.0
Cython           : None
pytest           : None
hypothesis       : 5.29.0
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : None
lxml.etree       : None
html5lib         : None
pymysql          : None
psycopg2         : None
jinja2           : 2.11.2
IPython          : None
pandas_datareader: None
bs4              : None
bottleneck       : None
fsspec           : None
fastparquet      : None
gcsfs            : None
matplotlib       : None
numexpr          : None
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : 1.0.1
pyxlsb           : None
s3fs             : None
scipy            : None
sqlalchemy       : None
tables           : None
tabulate         : None
xarray           : None
xlrd             : None
xlwt             : None
numba            : None

</details>
