During upgrade, Revit discovered that the highlighted elements were marked with tags of the wrong category. These tags were deleted.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.3.0.0 (26.3.0.0)
Syntax
C#
public static FailureDefinitionId ElementCategoryChangeInvalidatesTagUpgrade { get; }