Data is not getting replicated to secondary replicas after altering a table to enable region replication (async Wal replication)

Data is not getting replicated to secondary replicas after altering a table to enable region replication (async Wal replication)
Test Steps:
1)Create table with one replica 
create 'table1','cf'
2)Alter table with region replica=3
alter 'table1',{REGION_REPLICATION => '3'}
3)write data to table1 
Observation:
1)Data is not getting replicated to secondary replicas this is happening when alter table after the peer is created for region replication.
2)In table UI page also you can observe write requests showing for secondary replicas=0