Has the rate of finding Nemesis in echoes changed?

I can see how you might get that, but the change was simply for campaign, not monos.

So Nemesis still shows up in campaign, you just can’t keep farming them over and over again, since they will eventually stop showing up in that area.

Probably just bad luck. They should have a better spawn rate, I think. Anyway, the Nemesis isn’t guaranteed to show. It’s usually more effective to just rush the echo and eventually one will show up closer to you.

But, as far as I know, nothing has changed for Nemesis other than the 1.1.2 patch which actually increased the spawn rate by 15%.