Fix PTS continuity in sequences of copied streams. (#3628) #9711

Job	Run time
build_details	2s
build_js	1m 20s
pre-commit	3m 23s
lezer_parse	50s
build_no_depopts	5m 50s
build_opam (4.14.x)	5m 8s
build_opam (5.0.x)	5m 14s
build_posix (debian_trixie, amd64)	15m 30s
build_win32 (x64)	11m 6s
build_posix (debian_bookworm, amd64)	15m 21s
run_tests (@citest)	12m 44s
build_posix (ubuntu_jammy, amd64)	15m 17s
run_tests (@doctest)	8m 40s
build_posix (ubuntu_lunar, amd64)	14m 56s
tree_sitter_parse	57s
run_tests (@mediatest)	12m 5s
build_posix (alpine, amd64)	11m 20s
update_doc	11m 43s
fetch_s3_artifacts	22s
build_docker (amd64)	3m 6s
update_release	0s
build_docker_alpine (amd64)	46s
build_docker_minimal (amd64)	3m 11s
build_docker_alpine_minimal (amd64)	48s
build_docker_release	0s
build_docker_release-minimal	0s
	2h 39m 39s

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