Cannot save Layout Items - Like Grid or Slides

Returns this error - Slides has not been saved. Are you sure to skip the subform?

A simple procedure - Makes the whole template useless

Describe the bug
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To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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System Informations (please complete the following information):

• Joomla Version: [e.g. Joomla 5]
• PHP Version [e.g. PHP 8]
• Astroid Version [e.g. Astroid 3.1.0]
• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]

Additional context
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