I think, I found out the error. I tested various settings. When I removed the setting "Shutdown script terminates INDI" in the Ekos Settings, everything works fine. With the setting activated, the shutdown script won't start.
So problem solved I think, but when I look into the description of the setting, I don't really know why I shound't turn it on. So actually my script turns off some devices, so it would be nice if the disconnection errors will be removed. And like I said, in earlier versions this was my standard setting and it worked.

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