read_json and numpy=True and dtype=False does not preserve int64 dtype roundtrip on Windows
I don't have access to a PC so cannot replicate directly (if anyone else can would be appreciated) but going through #28510 there were a few Windows with dtype preservation, which would look something as follows:

```python
>>> df = pd.DataFrame(range(3))
>>> df.dtypes
0    int64
dtype: object
>>> pd.read_json(df.to_json()).dtypes
0    int32
dtype: object
```

Note that this may also be irrelevant if #28512 happens