Doodle Reactor, works in SBT on the Terminal, and as a worksheet in Metals, shows pop-up image; but not as `@main` method, neither in Metals nor on Terminal with `scala run ...`

reactor.scala

//> using dep org.creativescala::doodle:0.31.0

import cats.effect.unsafe.implicits.global
import concurrent.duration.FiniteDuration
import doodle.reactor.Reactor
import doodle.image.Image
import doodle.core.*
import doodle.syntax.all.*
import doodle.java2d.*
import doodle.core.Color.{deepSkyBlue, red}

val frame = Frame.default
  .withSize(600, 600)
  .withBackground(deepSkyBlue)
  .withTitle("Space Invaders")
  .withCenterAtOrigin

val TickRate = FiniteDuration(50, "milliseconds")
val image = Image.square(300).fillColor(red)

// This works with SBT on the Terminal, but not Scala-cli.
// Does not launch the pop-up window of Reactor when run,
// either in Metals (click "run | debug") or Terminal (`scala run reactor.scala`)
@main
def hello: Unit =
  Reactor
    .init[Int](0)
    .withOnTick(identity)
    .withRender(_ => image)
    .withOnMouseClick((p, w) => w)
    .withOnMouseMove((p, w) => w)
    .withStop(_ => false)
    .withTickRate(TickRate)
    .run(frame)

reactor.worksheet.sc

//> using dep org.creativescala::doodle:0.31.0

import cats.effect.unsafe.implicits.global
import concurrent.duration.FiniteDuration
import doodle.reactor.Reactor
import doodle.image.Image
import doodle.core.*
import doodle.syntax.all.*
import doodle.java2d.*
import doodle.core.Color.{deepSkyBlue, red}

val frame = Frame.default
  .withSize(600, 600)
  .withBackground(deepSkyBlue)
  .withTitle("Space Invaders")
  .withCenterAtOrigin

val TickRate = FiniteDuration(50, "milliseconds")
val image = Image.square(300).fillColor(red)

// This works just fine in Metals.
Reactor
  .init[Int](0)
  .withOnTick(identity)
  .withRender(_ => image)
  .withOnMouseClick((p, w) => w)
  .withOnMouseMove((p, w) => w)
  .withStop(_ => false)
  .withTickRate(TickRate)
  .run(frame)

Worksheet works:

SBT on the Terminal works:

@main method and running does not work:

Terminal:

Metals: