For example, this edit was proposed to an answer to my question. The bug is I see the checkmark when I go to this edit (I can't click checkmark however).
This will be fixed in the next build (build rev
2015.2.23.3113 on meta,
2015.2.23.2333 on sites).
This doesn't only apply to suggested edits. I also ran into this yesterday in the Very Low Quality queue.
Here too, i can't click it.