%time magic funtion prevents variable assigment when used in function

I'm using IPython version 7.27. The following code snippet throws a `NameError: name 'variable' is not defined`:

```
def test(msg):
%time variable = msg
print(variable)

test("moin")
```

The bug is similar to #11659 and #11813, but it seems to only occur when used inside a function body.