aria-hidden and focusable children

MathJax currently adds aria-hidden to its container element. When there are links in the MathJax output, such links are focusable but in aria-hidden parents which is problematic, e.g., for non-visual users tabbing to the link in an aria-hidden area and thus no accessible name. In addition, the link might not have an accessible name (e.g., in SVG output).

Oddly, this is the case even when the accessibility explorer is active (when aria-hidden shouldn't be necessary). It's also unfortunate in situations like $\ref{...}$.