Layout is scheduled twice

CMS Version

3.0.3 on a Windows Server 2019, with XAMPP v3.2.4

Issue

If I want to schedule a layout on a display, no matter if Costume or Always, the settings mask remains after pressing Save. If I then click Cancel or reload the page, the layout is scheduled twice. And as soon as I want to remove a scheduling after clicking on Delete an error is output with “Not Found” in the deletings mask. The layout was then deleted despite the error message.

I am very grateful for any advice

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