It's because a BLACKOUT_EV class belongs to CORE_EVENT class:
#Base class for Cell operations through KB
MC_KB_CONTROL ISA CORE_EVENT
severity : default = INFO;
MC_EV_CLASS : BLACKOUT_EV ISA MC_KB_CONTROL DEFINES
And default propagation rule to Presentation Server include EVENT class and his sub classes:
EVENT ($RAW_EVENT) where [cellinfo(POMEnabled)]
One of the options is to add additional rule in ppm_propagate.mrl or create new mrl with the rule below:
BLACKOUT_EV ($BLACKOUT_EVENT) where [cellinfo(POMEnabled)]
MC_CELL_DIR_COMPONENT ($ENTRIES) where
[ $ENTRIES.type == "gateway" AND $ENTRIES.subtype == "pn_server"]
Recompile and restart cell where you did a changes.
Hope this will solve issue.
Thanks Anatoly , Will try the same