When I have a .d2-file open and simulateneously the svg output as an image, changes and re-compiles to the file / buffer using C-c C-c or C-c C-b do not update the svg preview.

What I did: enable auto-revert-mode for the buffer

I don't know wheather this is an issue for the plugin to tackle, a d2 file mode creation issue or an Emacs issue.