Tensor TriangleMesh Property Usage causes Access violation Error

[gojushin]

Heya,

For me, everything that involves Tensor-based TriangleMeshes is severely unstable.

Take, for example:

def some_function(self, tmesh: open3d.cpu.pybind.t.geometry.TriangleMesh):
        verts = tmesh.vertex.positions.numpy()
        vert_vec = o3d.utility.Vector3iVector(verts)  # <--- Crashes here
        return vert_vec

Accessing/Using vert_vec in any way (sporadically) causes a crash due to an Access violation error (Process finished with exit code -1073741819 (0xC0000005))

(i.e. print(verts) also causes the crash.)

I got o3d from Pip and use it without Torch, Tensorflow, or anything, so everything runs on the CPU.
I had the problem first on 0.17, but it persisted even after upgrading to 0.18.
Numpy is up to date, in case that is relevant.

I'm running the function inside a QThread (although I followed directions from #4923, putting everything in main and even outside of a QThread, which didn't improve anything, sadly).

Sometimes, randomly, it works; other times, it doesn't.

Any advice on where else I could look for issues / what could cause the issue?