acfs snapshots not dropped

Hi guru''s,

I have a question concerning acfs and snapshots (Oracle version 12.1.0.2 on Rac).

I created a pdb  as see below;

SYS@TESTCDB_2>alter session set DB_CREATE_FILE_DEST='/u01ACFSSNAPSHOTS/TEST_PDB3_SC';

Session altered.

SYS@TESTCDB_2>create pluggable database TEST_PDB3_SC from TEST_PDB1 snapshot copy;

Pluggable database created.

SYS@TESTCDB_2>alter pluggable database TEST_PDB3_SC  open;

Pluggable database altered.

SYS@TESTCDB_2>alter session set container = TEST_PDB3_SC;

Session altered.

SYS@TESTCDB_2>select file_name from dba_data_files;

FILE_NAME

--------------------------------------------------------------------------------

/u01ACFSSNAPSHOTS/TEST_PDB3_SC/TEST_CDB/24F68C5637D472B5E053396C3292E943/datafile/o1_mf_system_c4xtrz62_.dbf