interDyMFoam: phi.oldTime() is not needed but U.oldTime() needs to be created

applications/solvers/multiphase/interFoam/interDyMFoam/correctPhi.H

@@ -52,7 +52,6 @@
             phiAbs = phi;
             phiAbs.oldTime() = phi;
             fvc::makeRelative(phi, U);
-            phi.oldTime() = phi;
         }
     }
 }

applications/solvers/multiphase/interFoam/interDyMFoam/interDyMFoam.C

@@ -81,6 +81,9 @@ int main(int argc, char *argv[])
         scalar timeBeforeMeshUpdate = runTime.elapsedCpuTime();
 
         {
+            // Ensure old-time U exists for mapping
+            U.oldTime();
+
             // Calculate the relative velocity used to map the relative flux phi
             volVectorField Urel("Urel", U);