I've checked on tenno.tools

And apparently on pc there have been 3 invasions involving blue potatoes and 3 invasions involving yellow potatoes in the last 42 days (assuming 6 weeks of nightwave so far).

On PS4 it's only been 2 invasions each.

But you can check this stuff yourself on tenno.tools.

I do agree though that the creds should be reworked a bit but mostly so newer players can get nitain easier without getting to higher ranks of nightwave. So more creds during early levels.

Potatoes have always been hard to get outside of lotus alerts tbh. Alerts you'd always miss, and in invasions they seemed to surface once a month or even once every two months + before nightwave.