  We prove that for every $n \ge 2$, there exists a pseudoconvex domain $\Omega
\subset \mathbb{C}^n$ such that $\mathfrak{c}^0(\Omega) \subsetneq
\mathfrak{c}^1(\Omega)$, where $\mathfrak{c}^k(\Omega)$ denotes the core of
$\Omega$ with respect to $\mathcal{C}^k$-smooth plurisubharmonic functions on
$\Omega$. Moreover, we show that there exists a bounded continuous
plurisubharmonic function on $\Omega$ that is not the pointwise limit of a
sequence of $\mathcal{C}^1$-smooth bounded plurisubharmonic functions on
$\Omega$.
