No converter found capable of converting from type [java.lang.String] to type [org.springframework.expression.Expression]

As far as I can track the issue down, due the commit for #2165 a regression has been created for issue #1979. I cannot start the application using a producer based expression property like ‘routingKeyExpression’ or ‘delayExpression’. If I comment them out, the application starts properly.

To Reproduce

spring:
  cloud:
    stream:
      bindings:
        inputMail:
          destination: ${rabbitmq.mail.exchange}
          group: ${rabbitmq.mail.queue}
          binder: rabbitMail
          consumer:
            maxAttempts: 1
        retryMail:
          destination: ${rabbitmq.mail.exchange}
          binder: rabbitMail
        dlqMail:
          destination: ${rabbitmq.mail.dlx}
          binder: rabbitMail
      binders:
        rabbitMail:
          type: rabbitMail
          environment:
            spring:
              cloud:
                stream:
                  rabbit:
                    bindings:
                      inputMail:
                        consumer:
                          autoBindDlq: true
                          queueNameGroupOnly: true
                          exchangeAutoDelete: false
                          deadLetterExchange: ${rabbitmq.mail.dlx}
                          delayedExchange: true
                      retryMail:
                        producer:
                          declareExchange: false
                          exchangeAutoDelete: false
                          delayExpression: 300000 # 5min
                      dlqMail:
                        producer:
                          declareExchange: false
                          exchangeAutoDelete: false
                          routingKeyExpression: '''${rabbitmq.mail.queue}'''

Version of the framework 3.1.3 (Spring cloud dependencies 2020.0.3) Spring Boot 2.4.5 and also with 2.4.7 Expected behavior Configuration works as in 3.1.2 (Spring cloud dependencies 2020.0.2)

The property will be resolved properly, but the application cannot start. Error message

Failed to bind properties under 'spring.cloud.stream.rabbit.bindings.dlqMail.producer.routing-key-expression' to org.springframework.expression.Expression:

    Property: spring.cloud.stream.rabbit.bindings.dlqMail.producer.routing-key-expression
    Value: 'mail-local'
    Origin: "spring.cloud.stream.rabbit.bindings.dlqMail.producer.routingKeyExpression" from property source "rabbitMail"
    Reason: No converter found capable of converting from type [java.lang.String] to type [org.springframework.expression.Expression]