CSS replacement tokens aren't replaced in portlet css

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 Alpha 1
• Fix Version/s: 7.0.0 Alpha 1
• Component/s: ~ [Archived] Frontend Infrastructure
• Labels: None
• Story Points: 9
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/30436

To reproduce:

1. Navigate to Site Admin -> Documents and Media
2. Drag a document into the page to upload.

Expected result:
There is a green success icon on the new document item.

Actual result:
There is no success icon, and there is a 404 error:

Failed to load resource: http://localhost:8080/o/comliferaymessageboardsweb/message_boards/css/@theme_image_path@/message_boards/quoteleft.png the server responded with a status of 404 (Not Found)

Notice the '@theme_image_path@' token in the URL.

This token IS being replaced correctly for all css in frontend-css-web and frontend-themes-web. This issue is only happening for portlet CSS.

The issue can also be reproduced in Message Boards with the 'quote' icons.