in 14w25a leaves don't render properly from close by they aren't see through from far away they are but the blocks behind them dont load.
water and lava aren't properly visible.
and particles seem to cause huge frame drops.
chunks load but in some chunks the blocks are invisible relogging fixes that but other chunks bug out.
flowing lava has an incorrect texture
dispensers dont face the way u place them
Related issues
duplicates
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Duplicate of MC-56917 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.