`spring-cloud-dependencies` upgrade drops `commons-collections4` version

As reported on Slack by @wabrit

I have a composite recipe which makes some changes to a POM; the source POM declares a dependency on org.apache.commons:commons-collections4 which is expressed via a property and dependency i.e.

<project>
  ...
  <properties>
    <commons-collections4.version>4.4</commons-collections4.version>
  </properties>
  <dependencies>
    <dependency>
      <dependency>
	<groupId>org.apache.commons</groupId>
	<artifactId>commons-collections4</artifactId>
        <version>${commons-collections4.version}</version>
      </dependency>

My recipe doesn't attempt to modify this dependency, and running under OR 2.6 indeed this dependency is not modified.
But under OR 2.15 after I run my recipe the dependency has had its <version> element removed, which causes a maven error Could not find artifact org.apache.commons:commons-collections4:pom:unknown
I'm not sure what's caused the pom to be changed in this way, nor how to fix it.

Start with the composite-recipe and Maven POM example in the issue, reproducing the behavior under OpenRewrite 2.6 and 2.15. Trace why an untouched commons-collections4 dependency loses its version property reference; done means the dependency retains its version and Maven no longer reports an unknown artifact.