custom blocks models added by addons dont render

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if it helps i can send my addon over?

heres my addon if you want to see the problem yourself

https://mega.nz/file/3hlUkBgL#vQStlyMIZvAS07oXh914sHBGCI2kPyFk3DcXXJtLczI

As requested, please answer the question in the previous comment.
Specifically, are the custom blocks larger than 1 normal block?

They are a bit bigger than a normal block, but some blocks like the couch I made is bigger than a block and that still renders.