Endless fissure missions - Reactant disappearing too soon

[Drufo]

When doing an endless fissure mission, before you get the reward there's a countdown, but I noticed that the reactant disappear before the countdown. I don't know if it's intended or not, but it makes little sense: what's the point of the countdown if not for making sure you can open the relic before the reward screen? It's a small thing, but I hope DE changes this.