When updating Program's portfolioId via API, its Solution does not get cleared, resulting in a duplicate in Tier 1 filter

Issue Summary

When updating Program's portfolioId via API, its Solution does not get cleared, resulting in a duplicate in Tier 1 filter.

Steps to Reproduce

1. Create a program
   1. put it in a Solution/Capabilities enabled Portfolio
   2. Select Solution parent
   3. Save
2. Use Patch to replace only portfolioId with a Portfolio that is NOT solution enabled
3. Refresh and check out Tier 1 filter - see that the Program appears under the old Portfolio and the new Portfolio

Expected Results

When updating a Program's Portfolio in UI, it clears the solutionId field. No duplicates are seen.

Actual Results

The solutionId field is not cleared when updating via API, resulting in duplicates showing in Tier 1 filter.

Workaround

Change the portfolio in UI.