For what it's worth, Parsoid is designating all sections of this article other than the lead section as non-editable (data-mw-section-id="-1"). They may want to investigate that. It seems to be the case going several revisions back, which suggests that the real culprit is probably a recent change to a transcluded template. Still, it's a bug for that to break mobile-html in this way, so a mobileapps update will be needed in any case.

Looks like this article was using {{stack begin}} without a corresponding {{stack end}}. Fixed in this diff which appears to have fixed it in the apps.

Thanks @Pcoombe! Nothing for use to do here. I am going to untag Parsoid here.

Yes, thanks very much for fixing that, @Pcoombe!

I am still trying to understand where exactly mobile-html went off the rails, but perhaps it's not worth sinking that much time into it. It does look like Domino (JS), while building up the DOM, gets tripped up by the large data-mw attribute of the style element near the top of the page.