Landscape suddenly goes flat when entering landscape mode

Hi everyone,

I’m relatively new to landscapes and have been working through a set of video tutorials. It’s been going great, but I’m suddenly running into a problem. I’ve sculpted a landscape, but as of this morning, whenever I enter landscape sculpting mode, it goes entirely flat. Does anyone have ideas about what might be causing this?

I recently created a new level and enabled World Composition, placing this as a sub-level. Could it be connected to this?

Before entering landscape mode:

After entering landscape mode:

Thank you in advance to anyone with ideas.