I cannot speak to situations involving applications for children, but I can share my experience with filing a K3 after filing an I130. We originally filed our I130 in September 2021. We filed an I129f in December of the same year. Our I129f was rejected on February 9, 2022. The VERY NEXT DAY our I130 was approved by USCIS on February 10, 2022. Perhaps it was a coincidence, but I suspect not.