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Without a Fill Mask, After Effects turns the layer into the fill colour and applies Opacity to its alpha; nothing of the original shows through. AE 2026 renders Fill (0, 0.5, 1) at Opacity 50 % on a Gradient Ramp over a red solid as premultiplied (0, 0.251, 0.502) at alpha 0.502 at every pixel; EffectCraft mixed the fill with the ramp (mean difference 95.5/255), now within 1/255, CPU and GPU. Invert fills the transparent part the same way. With a Fill Mask the mix with the original is unchanged (not measured). Lottie's fill effect (colour, alpha x opacity) now plays the same in EffectCraft. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>