M Odin from Clan God Soul....

2 purple stars, awaken to 3 purples.. leave My Team
7 Deadly Sins appears, awakening not saved.
Odin is back at 2 purple stars. Gold replenished.

2 purple stars, awaken to 3 purple stars
Awaken to 4 purple stars.. leave My Team
7 Deadly Sins appears, awakening not saved.
Odin is back at 2 purple stars. Gold Replenished.

In My team fresh.. upgrade any talisman or any other character.. leave My Team.
All upgrades save. Gold is gone.

In My Team Fresh, Upgrade any other talisman or character...
Awaken M Odin from 2 purple stars to 3 purple stars.... leave my team.
7 Deadly sins appears.. nothing was saved, including other talisman/character upgrades.

In My Team Fresh, Awaken M Odin from 2 purple stars to 3 purple stars.
Upgrade any other talisman or character... leave my team.
7 Deadly sins appears.. nothing was saved, including other talisman/character upgrades.

Note that gold gets replenished when the 7 deadly sins appears.
So I'm not losing gold when the awakening doesn't save.
But that's also an indicator that upgrades aren't saving.

Seems to ONLY be happening with this M Odin I got from a Clan God Soul.