While series expanding a function, I got an unexpected result, which seems like an error to me. I have boiled it down to this minimum (non) working example:

```
$Assumptions = p (Element) Reals && x (Element) Reals;
k = Conjugate((x^2*(1 + I *p))^2 - x^2*(1 + I*p));
Expand(FullSimplify(Series(k, {x, 0, 2})))
Series(FullSimplify(k), {x, 0, 2}) // TraditionalForm
```

This returns

```
-x^2 + I p x^2 + x^4 - 2 I p x^4 - p^2 x^4
```

and

```
I (p+I) x^2+O(x^3)
```

The second output, where I have first used `FullSimplify`

returns the correct output. To my understanding, the first output is wrong. Have I found a bug, or is there something about the `Series`

function I don’t understand.