It works for me.
> sessionInfo()
R version 3.6.3 (2020-02-29)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)
Matrix products: default
locale:
[1] LC_COLLATE=English_New Zealand.1252 LC_CTYPE=English_New Zealand.1252 LC_MONETARY=English_New Zealand.1252
[4] LC_NUMERIC=C LC_TIME=English_New Zealand.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] leaflet_2.0.3
loaded via a namespace (and not attached):
[1] htmlwidgets_1.5.2 compiler_3.6.3 magrittr_1.5 R6_2.5.0 htmltools_0.5.0 tools_3.6.3 yaml_2.2.1
[8] tinytex_0.27 crosstalk_1.1.0.1 jsonlite_1.7.1 digest_0.6.27 xfun_0.19 rlang_0.4.8