I noticed in the H5 branch the Newbie Guide was not casting the Life Cubic.
To correct this you need to change two lines in the NewbieGuide.Java file.
L2J_Mobius_CT_2.6_HighFive\dist\game\data\scripts\ai\others\NewbieGuide
Change lines 292 and 307 in the default file from
npc.doCast(LIFE_CUBIC_FOR_BEGINNERS.getSkill());
To
talker.doSimultaneousCast(LIFE_CUBIC_FOR_BEGINNERS.getSkill());