move errors to debug

corsika/detail/framework/core/Cascade.inl

@@ -296,6 +296,22 @@ namespace corsika {
 
       CORSIKA_LOG_DEBUG("step limit reached (e.g. deflection). nothing further happens.");
 
+      // final sanity check, no actions
+      {
+        auto const* numericalNodeAfterStep =
+            environment_.getUniverse()->getContainingNode(particle.getPosition());
+        CORSIKA_LOG_TRACE(
+            "Geometry check: numericalNodeAfterStep={} currentLogicalNode={}",
+            fmt::ptr(numericalNodeAfterStep), fmt::ptr(currentLogicalNode));
+        if (numericalNodeAfterStep != currentLogicalNode) {
+          CORSIKA_LOG_DEBUG(
+              "expect to be in node currentLogicalNode={} but are in "
+              "numericalNodeAfterStep={}. Continue, but without guarantee.",
+              fmt::ptr(currentLogicalNode), fmt::ptr(numericalNodeAfterStep));
+        }
+      }
+      // we did not cross any volume boundary
+
       // step length limit
       return;
     }

corsika/detail/modules/tracking/Intersect.inl

@@ -107,7 +107,7 @@ namespace corsika {
     // this branch cannot be unit-testes. This is malfunction: LCOV_EXCL_START
     if (minTime < 0_s) {
       if (minTime < -1e-8_s) {
-        CORSIKA_LOG_ERROR(
+        CORSIKA_LOG_DEBUG(
             "There is a very negative time step detected: {}. This is not physical and "
             "may "
             "easily crash subsequent modules. Set to 0_s, but CHECK AND FIX.",