RStudio won't connect to R after some Debian trixie upgrading (maybe electron/firewall?)

I had a flawlessly working R/RStudio setup. Since some 'normal' packages upgrading (Debian Testing 'trixie'), RStudio stopped connecting to R and the error message indicates a problem with electron. However, I am out of my depth here and searching online for this problem yielded so many different contexts that I am lost. I feel it is only some config issues under the hood: maybe electron, maybe firewall (although I have not fiddled with anything firewall - not consciously at least). So, thank you for any useful hints!

Screenshot 1 shows:

  • Versions of Debian, R and RStudio
  • Check that R is a standard install and is working
  • Output when rstudio is invoked from bash, inclulding with trace-warnings

Screenshot 2 would show the "Cannot Connect to R" error message and tips window of RStudio, but as a new user, I could not upload it. In any case, I tried the tips mentioned there.