I'm creating a composite action in GitHub Actions that launches an iOS simulator. There is a step which runs a shell script that selects a simulator based on certain inputs (device and OS version) then boots it with xcrun simctl bootstatus -b. Something like this:

.github/actions//action.yaml

# ...

runs:
  steps:
    - run: ${{ github.action_path }}/.sh

# ...

.github/actions//.sh

udid=$(command that returns udid)

echo "udid=$udid" >> $GITHUB_OUTPUT

xcrun simctl bootstatus $udid -b

However, it fails with the message:

Invalid device:

Error: Process completed with exit code 148.

In my investigations I've found two strange things:

• The output from xcrun simctl list devices does show a device with the UDID that bootstatus reports as invalid.

• Running xcrun simctl bootstatus -b as a separate step (i.e. not in the shell script) launches the device successfully.

  .github/actions//action.yaml

  # ...
  
  runs:
    steps:
      - run: ${{ github.action_path }}/.sh
        shell: bash
        id: 
      - run: xcrun simctl bootstatus ${{ steps..outputs.udid }} -b
        shell: bash
  # ...
  

  .github/actions//.sh

  udid=$(command that returns udid)
  
  echo "udid=$udid" >> $GITHUB_OUTPUT
  

Any ideas why this is happening and how to get xcrun simctl bootstatus -b working successfully inside the shell script?