Fix duplicate elements emitted by timeoutWith after timeout fires #6010

Job	Run time
Test I/O on macOS (macos-14, temurin@17, ioNative)	3m 22s
Test I/O on macOS (macos-14, temurin@17, ioJVM)	3m 20s
Test I/O on macOS (macos-14, temurin@17, ioJS)	2m 29s
Test (ubuntu-latest, 2.13, temurin@17, rootNative)	1m 12s
Generate Site (ubuntu-22.04, temurin@17)	4m 7s
Test (ubuntu-latest, 2.13, temurin@17, rootJS)	1m 3s
Test (ubuntu-latest, 3, temurin@17, rootJVM)	1m 9s
Test (ubuntu-latest, 2.13, temurin@17, rootJVM)	1m 5s
Test (ubuntu-latest, 3, temurin@17, rootJS)	1m 6s
Test (ubuntu-latest, 2.12, temurin@17, rootNative)	1m 18s
Test (ubuntu-latest, 2.12, temurin@17, rootJS)	1m 5s
Test (ubuntu-latest, 2.13, temurin@21, rootJVM)	1m 20s
Test (ubuntu-latest, 2.12, temurin@17, rootJVM)	1m 4s
Test (ubuntu-latest, 3, temurin@17, rootNative)	1m 19s
Submit Dependencies	0s
Publish Artifacts	0s
	24m 59s

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