can't update transaction-atomicity via configuration file

[sdojjy]

What did you do?

update transaction-atomicity from table to none
cdc cli changefeed update -c xxx --config cf.toml

[sink]
transaction-atomicity = "none"

What did you expect to see?

changefeed is started with transaction-atomicity ="none"

What did you see instead?

changefeed is started with transaction-atomicity ="table"

Versions of the cluster

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

TiCDC version (execute cdc version):

(paste TiCDC version here)
bash-5.1# /cdc version
Release Version: v6.1.2
Git Commit Hash: ae5423d942837e377123b15f9da3fa72d9ca6007
Git Branch: heads/refs/tags/v6.1.2
UTC Build Time: 2022-10-13 15:54:32
Go Version: go version go1.18.5 linux/amd64
Failpoint Build: false

[CharlesCheung96]

/assign

[CharlesCheung96]

/severity minor