blockbench export parents nodes very strangely

[chipsams]

when exporting using the blockbench plugin, the relationships between nodes are severely messed up, with random nodes being given the duty of parenting with no clear pattern. input tree in blockbench: output tree in CPM: apparently it's supposed to make a 0x0x0 cube for each folder, but it appears to have not done this. (version: 1.18.2 forge)