Maybe things have improved since 2016?
https://dl.acm.org/doi/10.1145/3345328
A Systematic Investigation of Replications in Computing Education Research by Hao et al.
According to this study, between 2009 and 2018, only 2.38% of the papers published in the top three conferences and top two journals on CS education were replications of previous studies. Which is better than for education in general (just 0.13%), but still pretty bad.