Create new changefeed with stopped changefeed checkpoint as start-ts sucessfully, but it will fail immediately

[Tammyxia]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do? If possible, provide a recipe for reproducing the error.

• Stop a changefeed by "cli changefeed pause xxx"
• After 2 minutes, create a new changefeed with the above stopped changefeed's checkpoint as --start-ts, which is succesful.
• After several seconds, check the new created changefeed, it become to be failed status.

2. What did you expect to see?

• The new created changefeed will not become failed because the stopped changefeed's checkpoint should be saved.

3. What did you see instead?
   

4. Versions of the cluster

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

     Release Version: v5.1.0
     Edition: Community
     Git Commit Hash: 4ca5d03fbe2fe1d2106a29a38b4c99be66b36eb1
     Git Branch: heads/refs/tags/v5.1.0
     UTC Build Time: 2021-06-17 07:24:39
     GoVersion: go1.16.4
     
     

   • TiCDC version (execute cdc version):

     [release-version=v5.1.0] [git-hash=a91a10bb5cd52ee22e56217402003a596a1b5f2b] [git-branch=heads/refs/tags/v5.1.0] [utc-build-time="2021-06-17 07:20:55"]