SE2: WARNING: PARALLEL_MAX_SERVERS value less than number of servers required for parallel recovery

Oracle Database 19c Standard Edition 2 (SE2): since Version 19.28 there are warnings in alert.log, after starting of database:

Alert.log

tail alert.log
Adjusting the default value of parameter parallel_max_servers
from 0 to 1 due to running in CDB mode
WARNING: Parameter PARALLEL_MAX_SERVERS value(1) is less than number of servers required(8) for parallel recovery
Starting ORACLE instance (normal) (OS id: 155255)
...
PDB$SEED(2):Pluggable database PDB$SEED opening in read only
(2):WARNING: Parameter PARALLEL_MAX_SERVERS value(1) is less than number of servers required(8) for parallel recovery
...
PDB01(3):Pluggable database PDB01 opening in read write
(3):WARNING: Parameter PARALLEL_MAX_SERVERS value(1) is less than number of servers required(8) for parallel recovery