ORA-32010: cannot find entry to delete in SPFILE

1. SQL> alter system reset "_time_based_rcv_ckpt_target" scope = spfile sid='aaa'

 *
ERROR at line 1:
ORA-32010: cannot find entry to delete in SPFILE

2. SQL> alter system reset "_bct_public_dba_buffer_size" sid='aaa' scope=spfile ;

System altered.

3. 😶