replication lag not refreshed when last ddl is failed and skipped, and no futher ddl

[D3Hunter]

What did you do?

• start all mode task
• in sync phase, run a ddl in upstream, and this ddl will fail on downstream
• task will paused, skip the ddl, then start task

What did you expect to see?

lag will down to 0

What did you see instead?

lag keep increasing

Versions of the cluster

DM version (run dmctl -V or dm-worker -V or dm-master -V):

v5.4.1

Upstream MySQL/MariaDB server version:

(paste upstream MySQL/MariaDB server version here)

Downstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

(paste TiDB cluster version here)

How did you deploy DM: tiup or manually?

(leave TiUP or manually here)

Other interesting information (system version, hardware config, etc):

>
>

current status of DM cluster (execute query-status <task-name> in dmctl)

(paste current status of DM cluster here)

[D3Hunter]

lag will down to 0 after execute another success ddl