Hi Izwdgc,
Development builds don’t have the editoronly data so they can’t use editor content.
Serialization will cause incorrect code path.
The large difference between cooked and uncooked content is the stripping of editor data and inlining of specific types of data (textures / materials).
For this reason only the editor which has editoronly data defined to true, can load the uncooked packages.
You could do your internal development builds editor with editor content and use -game to run the game.
We have been working on deterministic cooking and getting the output to be similar to the input. Perhaps you have a specific issue caused by some build settings which is causing every package to be updated erroneously?
Can you confirm that the cooker flags include -unversioned?