I’ve also struggled with this problem for a long time, but I’ve finally found a solution. I hope this helps others.
Problems
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When you set the ‘Editor Startup Map’ to a specific level in the Project Settings, the level’s title appears as ‘Untitled’ when you open the project.
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The water body doesn’t load, causing the Ocean, Lake, and River to disappear.
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Foliage that was placed disappears.
- In my case, the foliage placed on static meshes did not disappear.
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Landscape Brush and Foliage Brush do not work.
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These issues are resolved if you reopen the level, but they reoccur when you close and reopen the project.
- If you save without reopening the level, the foliage will be saved in the disappeared state.
(I hope people experiencing this issue can find this post through these keywords.)
Reason & Solution
This issue is suspected to occur because the level’s name was changed without using ‘Save As’.
When renaming, use ‘Save As’ to change the name.
Use ‘Save As’ to rename the problematic level.