I am also having a similar issue where beating adventures is not netting me any rewards.
I beat Fighter's Tale and did not receive the 5000 gold adventure reward.
I beat the Haunted Past on Legendary and did not receive Farmer's Daughter (not in unclaimed tab either).
I beat Perils of the Lost Coast on Legendary and did not receive Samisen (not in unclaimed tab either). Funny enough, Samisen appears in my collection under "owned" but I can't find it anywhere.
I tried removing the app and re-installing and that did not work.
mrsako #9998