`continue-on-error` cannot evaluate expression on environment variable

Describe the bug
jobs/continue-on-error cannot use environment variable in expression

To Reproduce
Using an expression in continue-on-error like this:

env:
  fullySupportedScalaVersions: "2.13.6"

  test:
    runs-on: ubuntu-latest

    continue-on-error: ${{ contains(env.fullySupportedScalaVersions, matrix.scalaVersion) }}

example: https://github.com/tek/splain/blob/6b12e57954aae0852e9b948e12ef5637c478b53d/.github/workflows/main.yml

Expected behavior
fullySupportedScalaVersions should be used to interpolate the expression

Runner Version and Platform

Version of your runner: latest

OS of the machine running the runner: ubuntu-latest

What's not working?

Invalid workflow file : .github/workflows/main.yml#L38
The workflow is not valid. .github/workflows/main.yml (Line: 38, Col: 24): Unrecognized named-value: 'env'. Located at position 10 within expression: contains(env.fullySupportedScalaVersions, matrix.scalaVersion) .github/workflows/main.yml (Line: 38, Col: 24): Unexpected value '${{ contains(env.fullySupportedScalaVersions, matrix.scalaVersion) }}'

Reproduce the validation error from .github/workflows/main.yml using an expression in continue-on-error that references env.fullySupportedScalaVersions. Start by tracing how that workflow expression is validated, then verify that the environment variable can be used with matrix.scalaVersion. Done means the workflow is accepted and the expression evaluates as expected.