In 4.8 preview 4, it appears that changes made to a landscape actor's CollisionThickness property in the editor are not being replicated in physX [...] It appears that what happens is that the engine detects that the heightField doesn't need cooking again ,either because it can be obtained from the DDC, or because it exists in the GSharedMeshRefs TMap.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-16517 in the post.
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| Component | UE - LD & Modeling - Terrain - Landscape |
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| Affects Versions | 4.8 |
| Target Fix | 4.9 |
| Fix Commit | 2578131 |
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| Created | Jun 3, 2015 |
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| Resolved | Jun 5, 2015 |
| Updated | Apr 27, 2018 |