OFS-filesystem information remaining in database even though its not mounted.

Oracle DB Version: 19.15.0.0.0

A database backup was restored to a new server (from ad2ht → tad1sm). There are remaining records of the OFS from the old system, which were mounted during the backup. How can this be cleaned up? I don't care about the data anymore in the OFS/Tablespace.

SQL+[tad1sm]SCADA_A:SYS> BEGIN
DBMS_FS.unmount_oracle_fs (
fsname => 'ofs_scada_tfl',
mount_point => '/home/ofs/ofs_spm_tfl/',
umount_options => 'force'
);
END;
/ 2 3 4 5 6 7 8
BEGIN
*
ERROR at line 1:
ORA-17677: failed to unmount 'ofs_scada_tfl' with error:'Attempt to unmount non-existent mountpoint'
ORA-06512: at "SYS.DBMS_FS", line 35