[core] Fix extraction seq with scheduling seq in group. #2258
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Previously, if the extraction seq is differ from scheduling seq, only some debug logs will be printed, and a dropreq will be sent, but the extraction seq will not be overridden (even for the first packet).
As #1119 (comment) said, we should use scheduling seq in group.
I will keep watching the error logs to see if we can safely override extraction seq with scheduling seq.