Flink CDC 为何oracle的scn号在每次checkpoint的时候不更新呢？

"Flink CDC 为何oracle的scn号在每次checkpoint的时候不更新呢？mysql的cdc， checkpoint难道不更新类似oracle的scn吗？ 不更新咋断点续传呢？第一次启动flink job 同步任务的时间， 这个oracle的scn不是时刻更新吗？？ 怎么是第一次启动的scn号呢？？
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 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

中断自动重启续传时， 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"