I just tested the feature
https://lists.wikimedia.org/pipermail/wikitech-ambassadors/2014-October/000991.html
with VisualEditor and it seems to be using a low resolution image instead of MathMl (while editing). When I save the page,
https://pt.wikipedia.org/w/index.php?diff=40380507
the formula disappears and it only reappear after I reload the page.
Version: unspecified
Severity: normal