The foliage instanced mesh, as well as ISM and HISM components both appears to be unable to export navmesh data for generation once we introduce a change in the contents. This error only shows up in a packaged game,
This was reported and tested in 4.22.2 (CL-6574378) and reproduced in 4.23 (CL-6836100)
You will need a Source Build of the Engine for this issue
Results: Once you introduce a change (eg Update Transform) in the instanced mesh tree the navmesh will ignore the instanced meshes, so the AI will not be able to navigate properly in these areas.
Expected: The navmesh will be properly regenerated around the ISM (foliage) exactly as it is happening in the Editor.
i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-75841 in the post.