My Alva broke

In the last 3 days i did >20 full temple rotations, and every single one of them either:

* Didn't give me a corruption chamber at all in all 12 turns
* Gave me a corruption chamber exactly once as a conversion into t1 or t2 with no chance to upgrade further (no adjancent upgrading rooms either)

I'm losing my mind here. I didn't change anything in my approach, it's the same it always have been this league and last league, but i suddenly went from almost 100% success rate to 0%

Stealth nerf to stimulate timelines scarab usage (it would have probably gave me a locus in half of the rotations), or just an example of long unlucky streak?

Any incursion runners, what is your experience recently?

I just did a few and went 2/3 on Timelines. Small sample size but seems to be working.

What if you didn't use the scarabs?