Issues with Transparent: Shadows on the Display Style list

I want to generate shadows using Display Style "Transparent - Shadows" but no shadows are found. What can I do?

Steps to Accomplish

By default, the setting is set to "30"  for "Transparency Threshold" under the category Render Mode for Transparent: Shadows.

1. Change and set to 80 (or 90) for "Transparency Threshold". Shadows will be displayed.

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