BUG: reading csv error : KeyError: 'x'
python 3.9.6 x64 on windows10pro,   vscode 1.58.2, pandas 1.3.0
![image](https://user-images.githubusercontent.com/87395223/126746250-54a871cd-a216-494f-a144-3e1a1f07971a.png)
[pandas-bug.zip](https://github.com/pandas-dev/pandas/files/6866965/pandas-bug.zip)

KeyError: 'x'
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
~\AppData\Roaming\Python\Python39\site-packages\IPython\core\formatters.py in __call__(self, obj)
    700                 type_pprinters=self.type_printers,
    701                 deferred_ppr