Are you under the impression that the debugger can debug pipelined functions in a package? I have been trying to use this for years and it still gives an almost immediate probe timeout.
14:32:50 Info: Starting debug session for *******
14:32:51 Info: Probe version 2.5 is being used
14:32:57 Error: ORA-06550: line 12, column 13: PLS-00653: aggregate/table functions are not allowed in PL/SQL scope
14:33:06 Info: Ending debug session for *******
14:33:06 Info: Done