Trees disapear while painting textures

Hi Im quite new into Unity and struggle painting a way across some trees. Everytime I start to paint the texture the trees disapear. It happen exactly during the time I hold the mouse button. I tried every different shading type but nothing keeps the trees staying.

Any Idea to solve this? Any alternative way?

Thanks!

Hello! This is the default behavior and there is not a way around that is available to users at the moment. It has been brought up internally that this might not always be wanted and your scenario is a perfect example of that.

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