Landscape Material problem in from 5.6 to 5.7

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Hi, the Landscape Material is just doing this (photo) weird behaviour. The painting is the same, but based on the square, it might get rendered another way. If i paint on it another time, it “might” happen, that one square changes to the other of the two states.

It started with port from 5.6 to 5.7.

i found, that the solution for this problem which other ppl helped, was to enable/disable “enable layer edit” option, which unfortunately since 5.7, doesnt excist anymore.

Note about my project:

-I did nothing in settings. Its basically no blueprints running i just do heightmap/place assets.

-No Nanite