Whilst building my work in progress PvP map, I had this glitch where even when I gave the player the invisibility effect, the player would not become invisible. I cannot reproduce this, as after reloading the map the invisibility effect did work, but I do have some screenshots of the issue.
Is this still an issue in the current Minecraft Snapshot 15w45a or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.