Whenever I try to import a heightmap for a terrain of size 32.512 x 32.512 the import always ends with an Assertion failed error stating the Requested memory allocation > Allocation limit. This error can be ignored and the heightmap did apply to the terrain. However, future issues that may arise (if any) from this error is undocumented.
This could relate to the CTD/BSOD ticket - https://feedback.bistudio.com/T181661