It seems that with the newest version of survcomp, the censor is missing (at least by default), as becomes clear from the vignettes. In version survcomp_1.18.0, the figure on page 20 of the vignette looks like this:

However, in version survcomp_1.22.0, the corresponding figure looks like this:

Clearly, the censoring is missing. How can I fix this?

I believe you can achieve plotting the censor information by adding the argument mark.time=TRUE when calling km.coxph.plot().   see ?plot.survfit from the survival package for more details.