Although I’m not entirely sure why disabling ‘Cast Ray Traced Shadows’ would help with your material, if you do need to edit this property frequently and aren’t sure how to do it via C++ or Blueprints, you could try my plugin, AssetProcessor.
This is a versatile plugin designed for bulk editing, filtering, and checking assets. You can edit almost any UProperty, including those only modifiable via C++, as long as you know the modification is valid.
Since 'Cast Ray Traced Shadows‘ is also a UProperty, this plugin can handle it as well. For disabling ‘Cast Ray Traced Shadows’, use the rule setup shown below.
Below are the YouTube tutorial video link and FAB link, hope this helps! 
