Peek function seems to be missing since B6

I’ve recently updated to 13.1 from b6 and noticed that the peek function no longer works (just a black line no matter which effect/color is displaying on LEDs).
I started backtracking and noticed the function missing in b7 also so I guess b6 was the last functional release for peek. I have tested this on 8266 and an esp32 and get the same results. Updates via manual OTA. Ideas?

Working in 0.13.2 alpha.