And I found the post when I got C3 Keqing.... It was 3 in a row and 4th 50-50 I lost overall and this was on Lyney's banner
Before I got C3 Keqing, I won three 50-50s after getting my guaranteed Yomiya in 3.2 (I have gotten Wanderer, Xiao, and Nahida before C3 Keqing).
Also, the times I pulled on a limited 5-star bow character (+ Tighnari since he became a standard 5-star character after his debut banner in 3.0), I get a Keqing Constellation
My guess that this is a sign not to pull for Limited 5-star characters who are bow users