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This issue is fixed in the next update
If you encounter and defeat a battle with a Treasure Gnome the Gnome may appear to drop no rewards. This is a visual issue only, and the rewards are grouped or calculated with the other types of resources. For example; you may earn 100 Souls in a battle normally, but an additional 5 souls will be earned as well.
NOTE: If playing in PVP, you can verse a Gnome troop card on the enemy's team. These will not drop rewards because it is a card and not an NPC.
To check you received the rewards, look for abnormally large amounts of resources.