Item Frames and signs turning invisible

in my main base i have a super item sorter I am building and since 14w29a (the one with the performance boost with rendering) entities i am not looking at like item frames and eventually sighns disappear after a few seconds. if i reset the game they come back.
the entity count is very high (around 200) but it did not happen before rendering patch.

Thank you very much hope to hear back

I tried to attach a zip file or my world but it is too large if u need a world download leave a comment and I will make one.