Describe the bug

Leaflet tiles are not showing in the web viewer.

To Reproduce
Steps to reproduce the behavior:

1. Install and load leaflet
2. Run leaflet %>% addTiles()
3. The plot opens up in the web viewer, there are zoom controls, but no map. It is all grey.

Do you want to fix by self? (We hope your help!)

Yes

(If yes,) what kind of help do you want? (e.g. Which file should I fix, Survey (related documents)

I'd love to help, but I don't know where to get started.

(If related)setting.json

// R path for Linux
"r.rterm.linux": "/home/<user>/.local/bin/radian",

// R command line options (i.e: --vanilla)
"r.rterm.option": [],

// An optional encoding to pass to R when executing the file, i.e. 'source(FILE, encoding=ENCODING)'
"r.source.encoding": "UTF-8",

// Keeping focus when running
"r.source.focus": "editor",

// Use active terminal for all commands, rather than creating a new R terminal
"r.alwaysUseActiveTerminal": false,

// Use bracketed paste mode
"r.bracketedPaste": true,

// Enable R session watcher (experimental)
"r.sessionWatcher": true,

// Delay in milliseconds before sending each line to rterm (only applies if r.bracketedPaste is false)
"r.rtermSendDelay": 8,

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Here is what is looks like in VS Code:

Here is what is looks like in RStudio:

Environment (please complete the following information):

• OS: Linux (Fedora 34)
• VSCode Version: 1.56.2
• R Version: 4.0.5
• vscode-R version: 1.6.8

Additional context

When running a shiny application, the map renders just fine.