Excav mode fissure rarely pop up

[IgnatiuSgaming]

well sound crazy but I already play aroud 3 hours streak but I didn't see excav fissure pop up
After distruption update its rarely pop up

Have a idea,what is going on? and anyone have some information when excav fissure pop up since I little lazy playing survival,defence and interception take so much time to finish

Thanks for advance

[Kelieto]

So I just checked the wiki and there are a total of 8 excavation missions, 3 of which are dark sector missions and I believe you can't get a fissure on dark sector missions (someone correct me if I'm wrong). This leaves you with a total of 5 excavation missions that could possibly become a void fissure. Disruption is very new and it already has more nodes that can become a void fissure. Compare it to the amount of other mission types and it starts to make more sense as to why it's rare!