Subtracting two meshes, this is the results, am I expecting too much or have I messed something up?

[rnbw]

I naively assumed that boolean operations would be easy to implement in unity, seeing how efficient they are in Blender, so I stupidly designed this whole concept around their use.
It should be kind of self-explanatory, but I'm generating a mesh for the saw blade and then trying to subtract that shape from a simple cube. Obviously, them staying in the air to visualize the mesh is temporary while figuring this out.

I'm not sure whether I have made a mistake while implementing it, or if my use-case is just too extreme for it to handle?

e: please note that the sawblade mesh is a closed 3d mesh, albeit pretty thin, not a single-sided "plane"

https://youtu.be/Z0CE-OYvtvM