Oracle has just released a warning about possible block and/or redo corruptions for 19.29 and 19.30 DBRU.
Please check out the following note for more details: KB867473
So far it seems only RAC databases are affected. This has been confirmed by a SR:
This bug is affecting database with multiple RAC instance.
Since oracle Restart uses ASM and its has only one db instance, oracle restart env and standalone db's are not affected.
This is not an ASM level bug and to highlight that it was described in such a way.