Massive memory consumption during movie render queue export

At the moment I have a serious problem to export animations with the movie render queue. My level consists a moon landscape from the marketplace with some buildings. When I export the movie the memory consumption rises quickly till windows gives me an out of memory error.

My PC is equipped with 64 GB ram! It must be a memory leak in the engine.

I am using lumen for GI and reflections. When I delete the landscape I can export my movie without any problems.
In the viewport everything is fine. There are no problems.

I hope this bug can be fixed in the final release of Unreal Engine 5.

Best regards, Andreas