No need to worry, we have such export feature now. Still its results are not all that determining..
Unwalkable - did you tested that in game? Cos there are many objects with doubtfull neighbours:
1 vs 9 (small rock and big rock have same byte)
58..60 vs 54..57 (corn vs vine are different?)
0 is walkable, 9 is not ...
big tree 173 vs big tree 170 - they have different values
etc..
Quad:
That looks like MultipleInstances, agreed

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