Database Hangs while impdp "DATABASE_EXPORT/STATISTICS/MARKER" at this stage I am using Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production

i am facing issue while impdp on other server. it hangs at the last line message below. it takes min. over 2-3 hours to continue. while importing i can not  find any error message on  alert log file or no any lock . then why it is taking too much time for importing ?

 -***************-
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/INDEX/INDEX
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/INDEX/FUNCTIONAL_INDEX/INDEX
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/CONSTRAINT/CONSTRAINT
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/INDEX/STATISTICS/FUNCTIONAL_INDEX/INDEX_STATISTICS
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/CONSTRAINT/REF_CONSTRAINT
Processing object type DATABASE_EXPORT/SCHEMA/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type DATABASE_EXPORT/STATISTICS/MARKER


here is my par file for impdp syntax :-

DIRECTORY=dir1
LOGFILE=abc_imp.LOG
DUMPFILE=abc.dmp
INCLUDE=SCHEMA:"IN('u1','u2','u3')"
include=role
content=METADATA_ONLY
TRANSFORM=SEGMENT_ATTRIBUTES:N


please let me know if any solution for this issue ?
Known bug, still under investigation.

Workaround is to use exclude=statistics.