Bug: running `diagrams-demo-project` error `TS2345: Argument of type 'Element' is not assignable to parameter of type 'ReactNode'. Property 'children' is missing in type 'Element' but required in type 'ReactPortal'.`

[dmoore247]

Following:

git clone ....
cd react-diagrams
pnpm install 
pnpm build

cd diagrams-demo-project
pnpm install
pnpm run start

then receive error (Which is similar DefinitelyTyped/DefinitelyTyped#66754)

react-diagrams/diagrams-demo-project/src/main.tsx(43,14)
      TS2345: Argument of type 'Element' is not assignable to parameter of type 'ReactNode'.
  Property 'children' is missing in type 'Element' but required in type 'ReactPortal'.

and browser opens.
Same error; close error panel (x), then functioning demo project appears

I'm a yarn/npm/pnpm/react noob, but I've been able to get other flowchart react programs to run.