The issue with spatially loaded landscape tiles being loaded without collision was reported before
Landscape Components Intermittently Loading with No Collision in Packaged Build
The discussion is closed and approaches tried grid cell settings to avoid landscape loading without collision.
I can confirm that spatial loaded landscape tiles with no collision is still an issue in 5.7.2.
Solution
Briefly tested, disabling the spatial loading setting an all landscape instances (proxies), appears to no longer present production builds with landscape tiles without collision.
Ideas
Perhaps, setting up landscapes with smaller tiles - matching world partition grid cells - can also be used, the reason for the missing collision.