On my world that I had just updated to 1.8, I saw some random 1.8 blocks in place of 1.7 blocks. I did not place them because I just updated the world. Plus I found these blocks in chunks that were loaded in 1.7(See Photos)
While looking around some more, I noticed some water blocks had dissapeared. (See Photos)
Thes weird things were only happening in already loaded ocean.
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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.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) to this ticket.
Are you using a texture pack? I have the impression that you do. I could be wrong.