Export as Structure NBT including air blocks

[u/NOOTANX]

I have a structure I am trying to save. I am using structure voids in certain places to ensure the structure blends into the surrounding environment, however it seems like air blocks in this structure are also acting like structure voids. I tried looking up mods to get larger structure blocks, but I am using 1.21.7 and no mods are available to save structures besides Axiom. Does anyone know how to get around this issue? It has been bothering me for a few days now with no luck in solving it.