Recently I noticed that Xiron the Ruby is failing to apply "Ignite" with Ruby Implosion a lot of the times. Yesterday, in a dungeon, it failed to apply ignite 3 of four times on monsters that are not hardened. Just now, in a dungeon, I attacked Sphyrnus who has "Attuned" status. The attack hit, and he was left with only possession. So, ignite and one of the control moves failed to stick. This just started yesterday, I think. Before that, Ruby was pretty consistent with applying all three status. I hope this is a bug, and not a nerf.
Edit: It's acting like a 50% chance now instead of the 95% like the Wiki says. In this screenshot, Laomu went first with Global Gloom. Then Xiron the Ruby went with Ruby Implosion. That left only possess on Sphyrnus. No ignite and no second control status.