Seek & Preserve : Possession events

The 2.1.3 patch notes claimed that the number ot possessions is now 2 per wave, but it’s still possible to get five events in a scenario.
In this instance, I got two possessions during wave 1, another possession ten seconds before wave 2 started, one possession with around 2:40 left on wave 2 and a fifth possession right before the end boss :

I’ve gotten two at once in E17 before. One was automatically fully possessed right next to one that I was able to click and save.