CreateAsync_ValidProcessInvalidServer_StdErrCallbackInvoked Test crash in CI

[ericstj]

Seeing the following in multiple runs on linux

The active Test Run was aborted because the host process exited unexpectedly. Please inspect the call stack above, if available, to get more information about where the exception originated from.
The test running when the crash occurred: 
ModelContextProtocol.Tests.Transport.StdioClientTransportTests.CreateAsync_ValidProcessInvalidServer_StdErrCallbackInvoked

This test may, or may not be the source of the crash.

Example: https://github.com/modelcontextprotocol/csharp-sdk/actions/runs/23216442557/job/67479648449?pr=1445