BUG #16931: source code problem about commit_ts

The following bug has been logged on the website:

Bug reference:      16931
Logged by:          lx zou
Email address:      zoulx1982@163.com
PostgreSQL version: 13.2
Operating system:   Linux
Description:

Hi,
recently i am reading commit ts code, and i have a problem about it.
i found commit_ts_redo call TransactionTreeSetCommitTsData with last param
`write_xlog`  true,
but RecordTransactionCommitPrepared and RecordTransactionCommit call
TransactionTreeSetCommitTsData 
with `write_xlog` false, which cause there are never xlog with commit_ts -
COMMIT_TS_SETTS type.
thanks for your time.

best wishes.