Argument quoting prevents expansion of glob expressions and environment variables on macOS

On macOS the following configuration results in an error.

<plugins>
  <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <version>3.5.0</version>
    <configuration>
      <skip>${skip.saving.reports}</skip>
    </configuration>
    <executions>
      <execution>
        <id>save_reports</id>
        <phase>post-integration-test</phase>
        <goals>
          <goal>exec</goal>
        </goals>
        <configuration>
          <executable>ls</executable>
          <arguments>
            <argument>src/*</argument>
          </arguments>
          <outputFile>out.log</outputFile>
        </configuration>
      </execution>
    </executions>
  </plugin>
</plugins>

$ cat out.log
ls: src/*: No such file or directory

This is despite the fact that the directory exists and is non-empty on my system:

$ ls src/*
src/main:
java		resources

src/test:
resources

To further illustrate the problem, trying to echo $SHELL will output "$SHELL" rather than expanding the variable.

<goals>
  <goal>exec</goal>
</goals>
<configuration>
  <executable>echo</executable>
  <arguments>
    <argument>$SHELL</argument>
  </arguments>
  <outputFile>out.log</outputFile>
</configuration>

$ cat out.log
$SHELL

I haven't checked any of the plugin's code but my suspicion is that the arguments are quoted which prevents the shell from expanding them.

Start by reproducing the exec goal with the shown executable, arguments, and outputFile configuration on macOS. Trace how the exec goal passes arguments to the command, then verify that the glob and environment-variable examples behave as expected without breaking other argument handling.