Looks like SSE is acting a bit dodgy again.

Steps to reproduce
1. Open up the Activity tab of a pipeline in one tab
2. Open a new browser tab and run the same pipeline
3. You don't see the new run appear in the first tab

I watched in classic to ensure that it was in the running state so it is not JENKINS-36209

Not sure if related - there is an error in the console:

GET https://ci.blueocean.io/sse-gateway/listen/jenkins_blueocean net::ERR_INCOMPLETE_CHUNKED_ENCODING