UE 5.3 crashing when trying to import a 16K heightmap

Development World Creation
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I did some more testing.

  1. Reduced the image size of the 8K tiles from 8192 x 8192 down to 8161 x 8161 in Photoshop. There’s still a seam.

  2. Generated 4K tiles out of Gaea at a resolution of 4033 x 4033 per tile. There’s still a seam.

  3. Tried importing these heightmap tiles in UE 4.7, 5.2 and 5.3. I’m seeing the same problem in each version.

I don’t understand what’s happening to the heightmaps in Unreal to produce this offset along the edges.

Edit: I should clarify that I’m importing the heightmap tiles one by one individually. If I choose to import all detected heightmap tiles automatically UE simply crashes either with an ‘Out of Memory’ error or with no error at all. And no, the World Partition minimap window is not open.