Hello,
strange behavior using version 6.0.2

    builder.HasIndex(e => e.AssetId)
        .IsUnique(false)
        .HasDatabaseName("IX_AssetOperationConditions_AssetId");

--> no error

[Index(nameof(AssetId), IsUnique = false, Name = "IX_AssetOperationConditions_AssetId")]
--> error
DIFFERENT: AssetOperationConditionEntity->Index 'AssetId', unique. Expected = True, found = False
NOT IN DATABASE: AssetOperationConditionEntity->Index 'AssetId', index constraint name. Expected = IX_AssetOperationConditions_AssetId1