IL2026, IL3050 show up in Error List, then disappear

**Version Used**: Visual Studio 2022 Update 14 (Dev17.14)

**Diagnostic Id**: IL2026, IL3050

> **IL3050** Using member 'StreamJsonRpc.JsonRpc.Attach()' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. This code generates IL at runtime and executes it.
> **IL2026** Using member 'StreamJsonRpc.JsonRpc.Attach()' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. This code generates IL at runtime and executes it.

**Repro steps**:

```
git clone https://github.com/microsoft/vs-streamjsonrpc.git
cd vs-streamjsonrpc
git checkout 835ae62576a8d7f60c186a9a1a79dbc7e547857d
.\init.ps1
StreamJsonRpc.slnx
```

Open some code files that are _not_ in the `NativeAOTCompatibility.Test` project.

**Expected Behavior**:

No warnings appear in the error list, consistent with build/publish at the CLI.

**Actual Behavior**:

While working in StreamJsonRpc, I frequently see this:

But when I double-click on them to see the source code, they vanish.
The linker does not produce any such warnings. So it seems these roslyn analyzers are defective.
I have "Entire Solution" set for both "Background code analysis" and "Show compiler errors and warnings for", BTW.