It seems that because of the width of the window, sometimes it does not flicker, but if you add or delete a character, it will flicker like in this gif.
latex example👇
\begin{array}{l}
a\mathop{{x}}\nolimits^{{2}}+bx+c=0 \\
\Delta =\mathop{{b}}\nolimits^{{2}}-4ac \\
\mathop{{x}}\nolimits_{{1,2}}=\frac{{-b \pm
\sqrt{{\mathop{{b}}\nolimits^{{2}}-4ac}}}}{{2a}} \\
\mathop{{x}}\nolimits_{{1}}+\mathop{{x}}\nolimits_{{2}}=-\frac{{b}}{{a}} \\
\mathop{{x}}\nolimits_{{1}}\mathop{{x}}\nolimits_{{2}}=\frac{{c}}{{a}}
\end{array}