JSXGraphm with MathJax in fullscreen

Question

I have this small piece of JSXgraph code:

JXG.Options.text.useMathJax = true; // <-- 
var board = JXG.JSXGraph.initBoard('BOX-test', { showFullscreen: true });
var point=board.create('point', [0,0]);

When I go in fullscreen mode, all good, but I have the following problem as soon as I try to drag something, like move the point: the board immediately goes back to its normal size, and stays on top of a weird gray page (I don't see my webpage anymore), like so: Gray page on top.

But as soon as I remove the first line JXG.Options.text.useMathJax = true;, the problem dissapears and I can drag the point in fullscreen mode.

This means that if the board contains some LaTeX, I can't really interact with the elements (points, sliders, etc.) when in fullscreen.

Note: I have observed this phenomenon on Firefox and Chrome, so the problem is apparently not related to the browser.