Not all MidPhases are enumerated in TSimCallbackObject::OnMidPhaseModification

Newly generated MidPhases are copied into the array accessible in the NarrowPhase after the OnPreSimulate callback is invoked. As a result, it is not possible to modify newly created MidPhases within the OnPreSimulate callback.

(see FCollisionConstraintAllocator::ProcessNewItems and its callers)

Applying the following workaround allows VisitMidPhases to iterate over all MidPhases in callback.

			template<typename TLambda>
			void VisitMidPhases(const TLambda& Visitor)
			{
				ProcessNewItems(); //add this call
				for (FParticlePairMidPhasePtr& MidPhase : ParticlePairMidPhases)
				{
					if (Visitor(*MidPhase) == ECollisionVisitorResult::Stop)
					{
						return;
					}
				}
			}

1. Download the reproduction project from the EPS case.
   *n this project, CCD for rigid bodies that come into contact with the vehicle is disabled inside TSimCallbackObject::OnPreSimulate_Internal.
   This is because when CCD is enabled, the vehicle's speed drops significantly upon contact with a rigid body, regardless of its mass.
2. Launch the project and start PIE.