Missing rule ID entries in Ruleset Editor when opening ruleset added to new SDK style project

I am using the latest internal VS dogfood build, but this repros on 15.7 as well.

***Repro Steps (Repro 1):***
1. Create a new .NET framework class library project (old project system)
2. Create an empty ruleset file named `MyRules.ruleset` at the root of project with following contents:
```

```
3. Add the following property to the project file to add ruleset to the project: `MyRules.ruleset`
4. Add a NuGet package reference to latest stable [FxCopAnalyzers package](https://www.nuget.org/packages/Microsoft.CodeAnalysis.FxCopAnalyzers)
5. Open `MyRules.ruleset` in the ruleset editor by executing `Solution Explorer -> Project Node -> References -> Analyzers -> Open Active Ruleset`
6. Search `CA1034` in the search box in the ruleset editor and confirm you get 2 entries, one for `Managed Binary Analysis` and one for `Microsoft.CodeQuality.Analyzers`:

7. Repeat the above steps for a new SDK style project .NET standard class library project.

***Expected***
Searching `CA1034` shows same 2 entries for SDK style project, that were seen in step 6 for old style project.

***Actual***
No matching entries