Netlify CLI hangs waiting for framework port 3000 on Astro 3

[wrainbird]

Describe the bug

With Astro 3 and Node v18>, Netlify CMS hangs on waiting for framework port 3000

Steps to reproduce

1. Run git clone https://github.com/wrainbird/astro3-netlify-cli-port-bug.git
2. Navigate to the project directory
3. Install dependencies
4. Run netlify dev

Configuration

[dev]
command = "yarn dev"
framework = "#custom"
targetPort = 3000

Environment

System:
OS: macOS 12.6
CPU: (10) arm64 Apple M1 Pro
Memory: 1.08 GB / 32.00 GB
Shell: 5.8.1 - /bin/zsh

Binaries:
Node: 18.17.1 - ~/.nvm/versions/node/v18.17.1/bin/node
Yarn: 1.22.17 - /opt/homebrew/bin/yarn
npm: 9.6.7 - ~/.nvm/versions/node/v18.17.1/bin/npm

npmGlobalPackages:
netlify-cli: 16.2.0

[wrainbird]

Will close now, with Astro 3 Netlify CMS will work if you set targetPort to 4321. Here is my updated netlify.toml file:

[dev]
  command = "yarn dev"
  framework = "#custom"
  targetPort = 4321