Well everyone on reddit is talking about how 28a can't open old maps only create new ones, but that's not what this is about. I keep crashing on my new map every five minutes and the last crash gave a really clear error: java.lang.IllegalArgumentException: Cannot set property bcl

to 3 on block minecraft:cocoa, it is not an allowed value

In other words, cocoa pod data value 3 is naturally occuring in the environment despite being an invalid data value (only 0-2 are used apparently). Full crash report included as an attachment. My map is completely unusable now that the cocoa pod "spacial anomaly" is within my view distance. Guess I could use MCEdit to teleport myself but why bother if it's just going to happen again? Reverting to week 27 until a functioning w28 is released.