[Game Update] Ver. 0.75

If I remember correctly, the level 120 cygnus mount was added in the same kMST patch as the first version of cpq2 along with the powerguard/whatnot changes, so the 120 cygnus quest being copypasted over is a good possibility.

Cygnus 120 quests have been in since the first day. The problem in GMS is that there is a map between Manon Forest and Griffey Forest with a crucial NPC that is currently missing, thus the quest cannot progress.