Interactive maps don't work yet... https://r-tmap.github.io/tmap/articles/32_versus_mapview.html

They do work in mapview: https://r-spatial.github.io/mapview/articles/mapview_01-basics.html

@tim-salabim I checked your rmd code, but couldn't find out what did the trick.
(Also check out the content, and let me know your thoughts)