In the latest snapshot, Whenever my player dies. All game entities become invisible. This re-occurs every time. And mobs that spawn after death are NOT invisible, however previous entities, including item frames and armour stands are. I have included 2 screen-shots of my survival world of before and after death.

This can be fixed by re-logging in single-player, I have not tested in multi player. Sometimes when re-logging in single player screen freezes, and game can only be closed by system restart...

Also I gained significant fps drop in the latest snapshots, In 1.8.8 I get anywhere from 30-40 fps and in 1.9 I only get around 16-24 fps, however fps does not drop at ALL in 1.9 if I turn up render distance to 24-32 chunks, while at 24 chunks in 1.8 my game would crash.