r - Leaflet Layer Tiles not switchable when .html (= .Rmd output) is opened with browser -


for several days now, basic layer tiles "osm" , "stamen.tonerlite" (which i've been using on year standard tiles maps) not shown correctly – i.e. it's not possible anymore switch between them.

as long map shown in rstudio , rstudio viewer, works perfectly. however, open corresponding .html-file of .rmd-output in browser (i tried chrome, internet explorer, edge , firefox), it's not possible anymore switch between tiles. either "osm" shown , can't switch "stamen.tonerlite" or vice versa.
i've tried different layer tiles or more 2 layer tiles, same result. there's 1 layer tile visible when switch others.

reproducible example case:

--- title: "stackoverflow" author: " " date: " " output: html_document ---  ```{r, echo = t} library(leaflet)  m <- leaflet() %>%      addtiles(group = "osm") %>%      addprovidertiles("stamen.tonerlite") %>%      addlayerscontrol(basegroups = c("osm", "stamen.tonerlite")) %>%      addcirclemarkers(lat = 47.4,                       lng = 9.37,                       radius = 10,                       fillopacity = 1.0) m ```

enter image description here

enter image description here

try this, point pipe in 2 provider tiles addtiles() argument

--- title: "stackoverflow" author: " " date: " " output: html_document ---  ```{r, echo = t} library(leaflet)  m <- leaflet() %>%  addtiles() %>%  addprovidertiles(providers$openstreetmap, group = "osm") %>%  addprovidertiles(providers$stamen.tonerlite, group = "toner lite") %>%  addlayerscontrol(basegroups = c("osm", "toner lite")) %>%  addcirclemarkers(lat = 47.4,                   lng = 9.37,                   radius = 10,                   fillopacity = 1.0) m ```

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