ORA-65107 + ORA-14694 trying to pen a 19.16 pluggable database in 19.25 RAC instances

Hi,

I'm moving some PDBs from 19.16 tp 19.25 (both in RAC mode)

Usually, my procedure is running fine

1. create a db link
2. create pluggable database DB1 from DB1@dblink ;
3. alter pluggable database DB1 open instances=all ; ⇒ error
4. $ORACLE_HOME/OPatch/datapatch —pdbs DB1
5. alter pluggable database DB1 close instances=all ;
6. alter pluggable database DB1 open instances=all ;

From one specific server, I'm not able to open any database

ERROR at line 1:
ORA-65107: Error encountered when processing the current task on instance:1
ORA-14694: database must in UPGRADE mode to begin MAX_STRING_SIZE migration

I already tried to apply a simple open without instances=all… same issue