check(0) is used in UpdateComponentCount () of LandscapeEditorObject.h.
This looks like an intentional check, but there is a possibility that the user may mistakenly select it.
1. Create Landscape.
2. Chane on ChangeComponentSize
3. Select ResizeMode "Invalid"
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-53624 in the post.