Decorative trees keep disappearing at specific spots when loading a save

I got a weird bug: Some decorative trees keep disappearing at specific spots when I try to load a save. I have to replant them again and again. Please notice the spruce trees I planted in the pictures below and take a look at my save folder.
Before


After

The same thing happened when I plant a tree next to this barrack:

The tree is gone as soons as I load the save:

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