Bug with Ygra's ability
When I turned Ygra, Eater of All into a Treasure with Kitesail Larcenist, all the creatures on the battlefield remained Food, even though Ygra had lost all abilities.
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Rezzahan#77802 commented
Removing abilities does not stop type changing effects, and any additional effects those might bring. This is due to how the layer system works: type changing happens in layer 4, ability removing in layer 6. So regardless of the order of the effects, types are chenged always before abilities are lost.
And due to rule 613.6, once an effect starts to apply, it will get to apply fully, even if the ability generating the effect is removed.