As evident in the following screenshot, the initial part of the equation (i.e., π = 4) can’t be seen in the editor.
HTML of front field:
this is front side 5. long mathjax equation<br><anki-mathjax block="true">\pi = 4 \left( 1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \frac{1}{11} + \frac{1}{13} - \frac{1}{15} + \frac{1}{17} - \frac{1}{19} + \frac{1}{21} - \frac{1}{23} + \frac{1}{25} - \frac{1}{27} + \frac{1}{29} - \frac{1}{31} + \frac{1}{33} - \frac{1}{35} + \frac{1}{37} - \frac{1}{39} + \frac{1}{41} - \frac{1}{43} + \ldots \right)</anki-mathjax><br><anki-mathjax block="true">\sin^2 \theta + \cos^2 \theta = 1</anki-mathjax><br>
This issue happens with any long mathjax equation.