Progress Bar Breaks After Being Wrapped in Retainer Box

Development Programming & Scripting UI
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Steps to Reproduce
Steps to Reproduce:

  1. Create a new project in Unreal Engine 5.5.4.
  2. Create a new Widget Blueprint.
  3. Add a Progress Bar to the widget.
  4. Wrap the Progress Bar inside a Retainer Box.
  5. Attempt to change the progress bar value dynamically from 0 to 1 (e.g., 0.25, 0.5, etc.).

Expected Result:

The progress bar should visually reflect the correct percentage value from 0 to 1.

Actual Result:

The progress bar only displays two states:

  • Fully empty (0)
  • Fully full (1)

Any intermediate values (e.g., 0.3, 0.5, 0.8) are not rendered correctly.