I was able to reproduce it/I have the same Problem in a world which was originally generated before Alpha 1.1.2 (Halloween Update). This bug only occurs in a small area maybe as big as a world seen with render distance 12.
So I tried to fix that:
Start your world in a pre-1.8 Version (e. g. 1.7.10), with a mod like WorldEdit installed (maybe you can also use MCEdit)
Mark all affected grass blocks (which you can see in your world with Minecraft 1.8+). Make sure the number isn't too big, your Computer may not be able to handle it! Use //Count grass to Count all grass blocks.
Replace the grass blocks with another block not used in your marked area. I used mushroom blocks (99), //Count is useful for seeing if a block is already used in that area
Replace all mushroom blocks or whatever you used with grass
Save!
Load your world with Minecraft 1.8+
This worked for me.
(Grüße an Galaxy_2Alex, wenn du hierüber stolperst! Vlt. kennst du meinen Namen ^^)
MeincraftManu
I was able to reproduce it/I have the same Problem in a world which was originally generated before Alpha 1.1.2 (Halloween Update). This bug only occurs in a small area maybe as big as a world seen with render distance 12.
So I tried to fix that:
Start your world in a pre-1.8 Version (e. g. 1.7.10), with a mod like WorldEdit installed (maybe you can also use MCEdit)
Mark all affected grass blocks (which you can see in your world with Minecraft 1.8+). Make sure the number isn't too big, your Computer may not be able to handle it! Use //Count grass to Count all grass blocks.
Replace the grass blocks with another block not used in your marked area. I used mushroom blocks (99), //Count is useful for seeing if a block is already used in that area
Replace all mushroom blocks or whatever you used with grass
Save!
Load your world with Minecraft 1.8+
This worked for me.
(Grüße an Galaxy_2Alex, wenn du hierüber stolperst! Vlt. kennst du meinen Namen ^^)