Bug Report: add_nevent throws an error when using tbl_survfit + survfit2

[kentm4]

The following code throws Error: Each of the survfit() objects must have class 'survfit' only. Multi-state models are not supported by this function. but using survfit instead of survfit2 the add_nevent() function works as expected. In most cases, it would be nice to create one model using survfit2 for KM plots using ggsurvfit and then passing the same model to the table functions (instead of switching to survfit for the tables.

library(gtsummary)

my_surv_model <- survfit2(Surv(time = time, event = status) ~ rx, data = df_colon)

tbl_survfit(
  x = my_surv_model,
  times = c(1, 2, 5),
  label_header = "**{time}-Year Survival**",
)  %>% 
  add_n() %>%
  add_nevent()

[ddsjoberg]

Sure, this check can be relaxed for survfit2 objects. I'll leave this open for now. not sure when i'll get to the update FYI