There is a Memory leak in PageAllocator when packaged. The leak can be stopped if "Landscape.Static" is used in console. Unable to test 4.19 since the provided project was 4.20, but Issue is reported to occur in 4.19 as well by the user
Found in 4.20 CL# 4302132 and 4.21 CL# 4321618
Results:
PageAllocator will continually use more and more memory
Expected:
Memory Leak would not occur
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-63484 in the post.