[Python] Why does flake8 flag E226 only when whitespace is missing on both sides of operator?

Here is a minimal reproducible example:

j = 0*0 # Flagged for E226.
j = 0* 0 # Not flagged for E226.
j = 0 *0 # Not flagged for E226.


As the comments suggest, flake8 flags only the first line, not the others, for E226:

$ flake8 tmp.py --ignore=E225,E231,E117,F401,F811,F841,E303
tmp.py:1:6: E226 missing whitespace around arithmetic operator


But Flake8 rules require a space before and after:

There should be one space before and after an arithmetic operator (+, -, /, and *).
​

I installed and updated flake8 with pip:

$ python3 -m pip install flake8 --upgrade


Why does flake8 flag only the first line?

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