The "Delayed Recovery" talent in Witcher 3 reads as follows if you put 3 talent points into it: "Potion effects don't wear off until potion Toxicity falls to 70% of the maximum level."
I've tried this and either it's not working or (more likely) I am misunderstanding something. Consuming 3 Decoctions puts me on 75% Toxicity so whether the toxicity of an additional potion wears off or not the talent should make the effect of the potion run as long as those decoctions keep me above 70%. However, consuming a swallow (for example) has the exact same duration and effect as if I didn't run this talent - after the usual potion duration of swallow the effect wears off even though I'm far above 70% at all times. How does this talent work exactly?