[BUG] Katex multi-line formula rendering failed

[haowu97]

Describe the bug

All multi-line formulas cannot be rendered. Such as

\begin{aligned}
P\left(\bigcup_{i=1}^{n} A_{i}\right)=&\sum_{1 \leqslant i \leqslant n} P\left(A_{i}\right)-\sum_{1 \leqslant i_{1}<i_{2} \leqslant n} P\left(A_{i_{1}} \cap A_{i_{2}}\right) & \\
&+\sum_{1 \leqslant i_{1}<i_{2}<i_{3} \leqslant n} P\left(A_{i_{1}} \cap A_{i_{2}} \cap A_{i_{3}}\right) \\
&-\cdots+(-1)^{n+1} P\left(A_{1} \cap A_{2} \cap \cdots \cap A_{n}\right)
\end{aligned}

\begin{array}{l}
\bigcup_{i=1}^{\infty} A_{i}=\left\{x \in S: x \in A_{i} \text { for some } i\right\} \\
\bigcap_{i=1}^{\infty} A_{i}=\left\{x \in S: x \in A_{i} \text { for all } i\right\}
\end{array}

Note that in-line formulas and single-line formulas are rendered normally.

Screenshots