Build tools will likely prefer "module" if it exists, fallback to "main" if it doesn't. See here
Current "module" field in package.json is pointing to "./src/index.js", which doesn't get published. Causing confusions for build tools, in my case, parcel-bundler.
@rocketspacer Released 3.4.4. Can you validate the fix?
Wow, that was fast. Yes, it is fixed at 3.4.4.