title: @Value default null value not working after spring upgrade
body: <p>An application that was using an older version of spring was migrated to springboot 2.2.4 release.</p>
  
  <p>After the upgrade, it is not picking up the property value here :</p>
  
  <pre><code>@Value("${stuff.value:#{null}}")
  </code></pre>
  
  <p>The value gets picked if I remove the :#{null} from the expression. 
  Any idea why this worked fine in older spring version but not now.</p>