added chain offset logic #6687

Job	Run time
1/4	13m 19s
2/4	15m 13s
3/4	14m 36s
4/4	13m 28s
py-3.11	13m 19s
flaky	6m 53s
_remote_background_indep_poll	5m 29s
_remote_background_indep_tcp	7m 48s
macos 1/5	21m 50s
macos 2/5	22m 59s
codecov	0s
	2h 14m 54s

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