I agree, I think there are actually two issues here.
I too have looked into the code before (try MCP if you want to look at less obfuscated code) and had come to believe there were a couple issues. One where they would run through the fences which could potentially be attributed to the AI and/or the new moulded fence blocks. And a second issue where it's placing them in the wrong spot when loading them from NBT.
In the case of when they run right through it this could be an issue with AI, however they still shouldn't be able to go right through the blocks. The fence blocks are new and this is where I have noticed baby mobs going through. The fences have the exact shape now, there seems to be a hole in them (for some reason this also causes lag issues with the lighting transparency on lower end computers). Has anyone seen a mob run right through any solid block, not a fence?
In the case of them loading in the wrong spot, I've tested and seen they will load outside of the area a few blocks away. There is no running through the block, they just simply load in the complete wrong spot. They will even load inside a wall or wherever. I can't be sure if it's an issue with loading or an issue with saving but I would bet with loading. It seems this will happen when a chunk loads but not every time a chunk loads.
These two issues may not even be related in any way other than mobs are escaping fences.
ryvix
I agree, I think there are actually two issues here.
I too have looked into the code before (try MCP if you want to look at less obfuscated code) and had come to believe there were a couple issues. One where they would run through the fences which could potentially be attributed to the AI and/or the new moulded fence blocks. And a second issue where it's placing them in the wrong spot when loading them from NBT.
In the case of when they run right through it this could be an issue with AI, however they still shouldn't be able to go right through the blocks. The fence blocks are new and this is where I have noticed baby mobs going through. The fences have the exact shape now, there seems to be a hole in them (for some reason this also causes lag issues with the lighting transparency on lower end computers). Has anyone seen a mob run right through any solid block, not a fence?
In the case of them loading in the wrong spot, I've tested and seen they will load outside of the area a few blocks away. There is no running through the block, they just simply load in the complete wrong spot. They will even load inside a wall or wherever. I can't be sure if it's an issue with loading or an issue with saving but I would bet with loading. It seems this will happen when a chunk loads but not every time a chunk loads.
These two issues may not even be related in any way other than mobs are escaping fences.