Avoid falling height reset if onGround state didn't change (bug #4411)

CHANGELOG.md

@@ -3,6 +3,7 @@
 
     Bug #2987: Editor: some chance and AI data fields can overflow
     Bug #3623: Fix HiDPI on Windows
+    Bug #4411: Reloading a saved game while falling prevents damage in some cases
     Bug #4540: Rain delay when exiting water
     Bug #4701: PrisonMarker record is not hardcoded like other markers
     Bug #4714: Crash upon game load in the repair menu while the "Your repair failed!" message is active

apps/openmw/mwphysics/physicssystem.cpp

@@ -1339,7 +1339,7 @@ namespace MWPhysics
             float heightDiff = position.z() - oldHeight;
 
             MWMechanics::CreatureStats& stats = iter->first.getClass().getCreatureStats(iter->first);
-            if ((wasOnGround && physicActor->getOnGround()) || flying || world->isSwimming(iter->first) || slowFall < 1)
+            if ((numSteps > 0 && wasOnGround && physicActor->getOnGround()) || flying || world->isSwimming(iter->first) || slowFall < 1)
                 stats.land(iter->first == player);
             else if (heightDiff < 0)
                 stats.addToFallHeight(-heightDiff);