ORA-14405 when dropping a tablespace with no data

I was cleaning up tablespaces and wanted to delete one, and after moving all the segments from it, I got the following:

SCOTT.OE> drop tablespace fact_index including contents and datafiles;
drop tablespace fact_index including contents and datafiles
*
ERROR at line 1:
ORA-14405: partitioned index contains partitions in a different tablespace

I tried looking for where all the schemas had data in all tablespaces. No luck.