Akka.Streams ShellRegistered message to Self was dead lettered

[Arkatufus]

Version Information

Version of Akka.NET? 1.5.30.1

Which Akka.NET Modules? Akka.Streams

Describe the bug

• Akka.Streams with multiple sub-streams being executed inside SelectAsync<T>
• ActorGraphInterpreter actor sends ShellRegistered message to Self during stream initialization and the message was dead lettered.

[INFO][10/30/2024 13:25:12.798Z][Thread 0011][akka://test-system/user/StreamSupervisor-0/Flow-1-0-unknown-operation] Message [ShellRegistered] from [akka://test-system/user/StreamSupervisor-0/Flow-1-0-unknown-operation#1309270448] to [akka://test-system/user/StreamSupervisor-0/Flow-1-0-unknown-operation#1309270448] was not delivered. [1] dead letters encountered. If this is not an expected behavior then [akka://test-system/user/StreamSupervisor-0/Flow-1-0-unknown-operation#1309270448] may have terminated unexpectedly. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'. Message content: Akka.Streams.Implementation.Fusing.ActorGraphInterpreter+ShellRegistered

Reproduction

https://github.com/Arkatufus/akka-7369-reproduction