Variables in user macro are not resolved

Problem

Inserting a User Macro with variables in a Confluence page results in the variables to be displayed as it and not substituted with their values.

Environment

Confluence v7.19.7
Postgres 13
OS: Linux

Steps to Reproduce

1. Login as admin
2. Define a new User Macro with the below template code:

   ## @noparams
   #set($userDetailsManager = $containerContext.getComponent('userDetailsManager'))
   
   #set( $user = $action.remoteUser)
   <h1>
   Hello $req.userPrincipal.name</h1>
   <br />
   Hello $action.remoteUser.name
   <br />
   Hello $user.name
   
   <pre>
   $action.authenticatedUser.name
   $action.authenticatedUser.fullName
   $action.authenticatedUser.key
   $action.dateFormatter.formatGivenString("yyyy-MM-dd", $content.getCreationDate())
   
   </pre>
   

1. Set Macro Body Processing to Rendered
2. Create a new page and add the macro created above.
3. Save the page

Expected Results

(Add expected results for current action)
Variables in the macro are resolved.

Actual Results

(Add actual results for current action)
Macro displays as shown below:

Workaround

Please review the User Macro administration interface and the documentation at Confluence objects accessible from Velocity to determine what modules should be allow listed.

Modules can be added using the system property below

-Dmacro.required.velocity.context.keys=comma,seperated,key,values