BUG #17221: Data sending resume

The following bug has been logged on the website:

Bug reference:      17221
Logged by:          Mohan nagandlla
Email address:      nagandllamohan@gmail.com
PostgreSQL version: 13.3
Operating system:   Alpine:3.13
Description:

HI team ,
I Have query that is let we assume I have HA postgres setup by repmgr. Now i
was copying the data from local file in size 10 GB to database. In mean
while let we assume master was down so before the master node down the data
5 GB sent if I again try to send the data to new master isn't the database
will collect the remining 5 GB data only or it will start from beginning of
the file again?