I cant believe you still insist with this BS.
Make a file thats 65535 pixel wide.
Color it from black to white in a 16 bit program.
Import it to the engine as a landscape. (Obviously tiles)
Open the file in photoshop.
Save it. (Batch the tile set).
Import it as a new landscape.
Compare the 2 results.
And then stop spreading misinformation that is only going to wreck people’s projects.
And if any Epic tutorials mention using photoshop in conjunction with heightmaps, report them here / to epic for them being BS.