Fix issues with AsyncBufferSequence.LineSequence #112

Job	Run time
CMake Build	48s
Test / macOS (Xcode 16.3 - sequoia - ARM64)	1m 0s
Test / Windows (6.1 - windows-2022)	11m 21s
Test / Windows (nightly-main - windows-2019)	10m 7s
Test / Linux (6.1 - noble)	51s
Test / Linux (6.1 - focal)	52s
Test / Linux (6.1 - jammy)	52s
Test / Linux (6.1 - rhel-ubi9)	59s
Test / Linux (nightly-main - rhel-ubi9)	1m 13s
Test / Linux (nightly-main - focal)	58s
Test / Linux (nightly-main - noble)	1m 1s
Test / Linux (nightly-main - jammy)	59s
Soundness / Unacceptable language check	0s
Soundness / License headers check	5s
Soundness / Format check	0s
Soundness / API breakage check	0s
Soundness / Documentation check	0s
Soundness / Shell check	36s
Soundness / YAML lint check	3s
Soundness / Broken symlinks check	6s
Soundness / Python lint check	6s
	31m 57s

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