A tibble when nested inside another tibble and row bind warns about row names even if no row names are used (version 3.1.2):
library("tibble")
zd <- tibble(a = NA)
z2 <- tibble(place = zd)
z3 <- data.frame(place = zd)
rbind(z2)
#> Warning: Setting row names on a tibble is deprecated.
#> # A tibble: 1 x 1
#> place$a
#> <lgl>
#> 1 NA
rbind(z3)
#> a
#> 1 NA
Created on 2021-06-23 by the reprex package (v2.0.0)