Editing a description field in Brightspace (in Content, Discussions, Assignments, Quizzes) that was remediated in Panorama for "the item does not have an alternative description" by marking the image as decorative causes the remediation to disappear and the problem to reappear in Panorama.
If you remediate a description field in Brightspace that has "the item does not have an alternative description" issue:
and fix the issue by marking the image as decorative, then apply the changes, the issue will be resolved in Panorama and Brightspace.
However, if you need to edit the description field again for any reason, the remediation disappears from the description field and the issue "the item does not have an alternative description" reappears in Panorama.
Recommendation: Make other changes to remediate these fields in Panorama until YuJa or Brightspace provides an ETA on a resolution.