The code below used to produce grid maps for each province and a map where each province is its own layer respectively. Has the option "as.layers = TRUE" been disabled in tmap v4?

library(tmap)
library(sf)
data(NLD_muni)

# Grid maps for each province
tmap_mode("view")
tm_shape(NLD_muni) +
  tm_polygons("employment_rate") +
  tm_facets("province", as.layers = FALSE)

# Map where each province is its own layer
tmap_mode("view")
tm_shape(NLD_muni) +
  tm_polygons("employment_rate") +
  tm_facets("province", as.layers = TRUE)

I'd like to know if this is a bug in tmap v4, or if I need to update my tmap v3 code to get the previous result where each province is displayed as an interactive layer.