Core/vmaps: Reset BIH::bounds on tree rebuilds

src/common/Collision/BoundingIntervalHierarchy.h

@@ -69,6 +69,7 @@ class TC_COMMON_API BIH
         {
             tree.clear();
             objects.clear();
+            bounds = G3D::AABox::empty();
             // create space for the first node
             tree.push_back(3u << 30u); // dummy leaf
             tree.insert(tree.end(), 2, 0);