You can use the cvar (console command) : landscape.nanite.marchingsquarevisibility=false.
Epic changed the algorithm to export Landscapes to raw meshes, but the new algorithm is unstable. This cvar will rollback to the previous algorithm.
There is a fix on Epic’s main branch (they also removed the old algorithm and the cvar), but it isn’t really trivial to integrate. But it is very likely to be fixed properly for 5.4.
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