Hi, not sure where else to post this but two members of my alliance finished the Shrikewood quest today and neither received the Mysterious Tonic in their inventory. Please look into this bug as it is very frustrating to very rarely come across these rare items and then once they do come around are glitched out of the inventories. PLEASE look into this issue for the sanity of your community.
Have you contacted Game Support yet?
https://smallgiant.zendesk.com/hc/en-us/articles/360000542934-How-to-Contact-Support-v1-9-7-onwards-