Composite Actions fail to overwrite env if it is already set

[thboop]

Describe the bug
Setting an env that is already set in a composite action causes the value to not be set as expected.
To Reproduce
Setup a composite action

  using: "composite"
  steps:
    - name: set env
      shell: bash
      run: |
        VAR1=$RANDOM
        echo "MY_VAR1=$(echo $VAR1)" >> $GITHUB_ENV
        echo $VAR1
        echo 'create finished'
  
    # Show ref information
    - name: Show ref information
      run: |
          echo 'random1'
          echo $MY_VAR1
          echo 'env-random1'
          echo "${{ env.MY_VAR1 }}"
          echo 'read finished'
      shell: bash

Call it twice locally using uses: ./{path}
Notice the second time the value it reads is incorrect.
Expected behavior
A clear and concise description of what you expected to happen.

Runner Version and Platform

2.291.1 linux

[ChristopherHX]

I believe this is a duplicate of #789, which could be fixed by #1794.