The problem with Landmass Brush Blueprint

Hi everyone! Does anyone can help me with such a problem:

What?

I Have created my level in UE4 (4.24.3-11590370+++UE4+Release-4.24) according to the https://www.youtube.com/watch?v=gbj1qgPOl3E

Everything was OK, but now I need to draw My texture on the landscape, and when I choose Modes->Landscape-> Paint and select the desired level,

The created Landmass are disappearing and could not be returned.

I think it’s a bug with the Landmass plugin, but maybe it is my fault and I create something wrong?
please see a screenshot here:
Expected result:

](filedata/fetch?id=1778402&d=1592649554)
Actual result:
](filedata/fetch?id=1778406&d=1592649733)

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