Exported litematic crashes game

[unofficial-fish]

Here is my model:
zeppframe.zip
Here is my model before being exported from ObjToSchematic:

Here is the exported file:
crash.zip
This file always causes a game crash because BlockStates in Regions in the nbt data is almost exactly half the length it should be. Padding that with zeroes to the right length, we get this scrambled model:

This happens every time, and seemingly with all settings, with this model and some other similar ones, like this: zeppframequarter.zip
Other models seem to work fine.