Uhc bug

[ItsTrigonex]

I don't know if anyone can help me ill try.
Everytime i play uhc there are floating blocks on the not rendered chunks, and it kills my fps + it distracts me from the game
yes im using 1.8.9, yes ive tried reseting video settings, yes im using optifine, yes im only using 8 render distance, and yes ive tried F3 + A.
If anyone can help me i would really appreciate it!!

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