I have not tried it yet this year but had that happen to me last year. It seems you have to try a different gacha if the one you feed does not work. And if you fed one to much that was giving a return it would suddenly stop. Never new if that was a chance dynamic or glitch. Try another gacha.
Gacha spits out a gemstone so watch for it don't let it get out of sight slip into the ground.
I'm on pc-pve will try when I log back in.
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update:
Yep still works for me. Just try another gacha and put in only one at a time. GL