Unfortunately Sending you a sample project would require “Management approval” BS, however I think I found a workaround which maybe the permanent solution!
This worked for us:
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Landscape Mode / Manage/ Selection Tools / Go To Change Component Size
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Set Resize Mode to "Resample (leave everything else the same)
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Apply (this may take a few seconds)
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When the process is complete/ build pathing if u have NPCs /
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Save close the editor
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Reopen editor / test / Player should no longer fall through the terrain
Hope this is not just a workaround but a solution to this issue, please let us know if this works for everyone.
Thanks!