Feeding the Omni Plant with Supernatural fish

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I've completed the Omni Plant opportunity and got the seeds. Then I fed the plant with fairy damsel fish.
However, the plant is stuck in harvest state with no fish appearing. The same goes with Luminous salamander and toad.
Is there anything I can do?
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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: imso Gabriel, Rachel Claire, Ryutaro Tsukata, Lauro Barlan