Landscape broken, Artifacting after deletion

Had a colleague that have made and sculpted landscape for the island we where working on, last week. This week I open up the scene and 6 out of 16 squares of the landscape remain rest is somehow gone. I then try to fill in the missing squares with add and then UEFN editor crashes when I open it again now only 2 out of 16 squares remain. I then delete the landscape and make a new. Now I suddenly have the full old landscape in the island when I launch a session but none of that old landscape exists in the outliner.

Thank you for your report! We would like to look into this further, would you be able to submit a bug report using the form available here? Fortnite Creative

I would but the upload of error logs does not work and you set it as a required field.

It btw just came back again again the whole old island just reappeared in the outliner after loading another level and the loading back this level