It seems CRAN recently added new checks, and I am now getting those issues with my pkg lgr which has a lot of R6 documentation:
https://www.r-project.org/nosvn/R.check/r-devel-windows-x86_64/lgr-00check.html
I heavily rely on inheritance and tbh the roxygen in this project might be a bit confusing, but to me it still looks like a bug in roxygen generating the wrong anchor name (using the name of parent class)