It appears that Fusion Summoning doesn’t work at all. I noticed it at first in hand testing, where I could’nt activate any Fusion Spells, then I tried a ranked game, but the result was the same. Coincidentally my opponent played Tearlaments and it seemed that they were unable to Fusion Summon as well, so it’s probably not just Fusion Spells (I tried Branded Fusion and Chimera Fusion). In case of Fusion Spells, it is only possible to set them, even if you have a Fusion Monster in the Extra Deck as well as the materials in hand or Deck (wherever they’re required to be).
Fusion Summoning worked today, literally a few hours ago.
There was probably an error notification that might have mentioned something about Fusions when I first went into hand testing, but it looked like another tournament notification and I automatically closed it.
Bug reproduction steps
Step 1. Have Chimera the King of Phantom Beasts in your Extra Deck, Gazelle, the King of Mythical Claws, Big-Winged Berfomet and Chimera Fusion in your hand.
Step 2. Activate Chimera Fusion
- Screenshot OR error code
Chimera Fusion activates, the Fusion Monster can be Special Summoned.
What OS are you using