wall contact not detected

I have encountered a strange behaviour in very rare cases when a particle hits exactly a common node of two triangles.
Attached a simple testcase with a single particle and a mesh with two triangles.
When the particle is at
0.075 0.0750001 0.425
everything works fine,
but if it is at
0.0750001 0.075 0.425
the contact is not detected.
I looked deep in the code but don't understand everything what happens in tri_mesh_I resolveEdgeContactBary.
The function everytime ends up in

....
else{
double closestPoint[3];
if(!edgeActive(iTri)[iEdge])
return LARGE_TRIMESH;

It seems to me that for both triangles the edge is not active, and in this case the distance is not calculated by any triangle.

Cheers,
Christian.