It appears from discussion with user that adding new variables to a script, which is on a prefab that later is built to an asset bundle can cause loading the bundle to crash with out of memory.

My best *guess* is that the fields are not serialized to the prefab. When trying to load asset, it is looking for the serialized field for the next string, but load garbage, causing the string to allocate an insane amount of memory (like 1 GB). Just a guess though.