Take two independent triangular arrays $x_{N,i}$ and $y_{N,i}$ for $1 \le i \le N$. Suppose that the sample means both converge in probability to zero
$$
\frac1N \sum_{i=1}^N x_{N,i} \xrightarrow{\mathcal{P}} 0
$$
$$
\frac1N \sum_{i=1}^N y_{N,i} \xrightarrow{\mathcal{P}} 0
$$
and further (for good measure) all sample moments of every order $n \ge 2$ converge in probability to some constants
$$
\frac1N \sum_{i=1}^N |x_{N,i}|^n \xrightarrow{\mathcal{P}} a_n
$$
$$
\frac1N \sum_{i=1}^N |y_{N,i}|^n \xrightarrow{\mathcal{P}} b_n
$$
Then is it true that the sample covariance converges in probability to zero?
$$
\frac1N \sum_{i=1}^N x_{N,i}y_{N,i} \xrightarrow{\mathcal{P}} 0
$$
In the case of finite moments this is easy to show with expectation, but I am struggling to find a reference otherwise.