Flink CDC啥情况会导致checkpoint的scn不更新？

"Flink CDC啥情况会导致checkpoint的scn不更新？
oracle cdc 的flink 同步任务，

flink checkpoint的配置如下：

execution.checkpointing.interval: 5min
execution.checkpointing.externalized-checkpoint-retention: DELETE_ON_CANCELLATION
execution.checkpointing.max-concurrent-checkpoints: 1
execution.checkpointing.min-pause: 500
execution.checkpointing.mode: EXACTLY_ONCE
execution.checkpointing.timeout: 10min
execution.checkpointing.tolerable-failed-checkpoints: 20
state.backend.type: filesystem
state.checkpoints.dir: file:///mnt/nfs/flink/checkpoints
state.savepoints.dir: file:///mnt/nfs/flink/savepoints

网络故障中断后，通过checkpoint的scn恢复续传时， 报错
Caused by: io.debezium.DebeziumException: Online REDO LOG files or archive log files do not contain the offset scn 23867001247. Please perform a new snapshot.

oracle 查scn的生成时间，

SQL> select THREAD#, SEQUENCE#, RESETLOGS_ID, FIRST_CHANGE#, NEXT_CHANGE#, FIRST_TIME, NEXTTIME from sys.v$archived_log where DEST_ID=1 and FIRST_CHANGE# <=23867001247 and NEXT_CHANGE#>=23867001247;

THREAD# SEQUENCE# RESETLOGS_ID FIRST_CHANGE# NEXT_CHANGE# FIRST_TIM

NEXT_TIME

2 5756 1074621776 2.3448E+10 2.3479E+10 09-APR-24
10-APR-24

1 4577 1074621776 2.3465E+10 2.3479E+10 09-APR-24
10-APR-24

这个时间时我第一次启动该flink job 同步任务的时间， 说明配置的每5分钟checkpoint的scn号没有更新， 但是checkpoint的状态一直是正常的。"