I have the 2 following GitHub Actions steps.

The first one checks if at least one of 2 files is empty and sets a step output to 1 if so. The second one is executed based on this condition.

            - name: check if any results were found
              if: github.event.pull_request.merged == true
              id: check-results
              shell: bash
              run: |
                if [ -s fileA ] || [ -s fileB ]; then
                  echo "Results found"
                  echo "found=1" > results
                else
                  echo "No results found"
                  echo "found=0" > results
                fi

            - name: send slack notificationq
              if: ${{ steps.check-results.outputs.found == 1 }} && github.event.pull_request.merged == true 
              shell: bash
              run: |
                echo ${{ steps.check-results.outputs.found }}
                echo "Results found"
                cat results

Why does the second one gets executed given that the logs explicitly show that ${{ steps.check-results.outputs.found }} is equal to 0?