Subsequent theme deployments do not apply css changes

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.0.0 DXP FP13, 7.0.0 DXP SP3, 7.0.3 CE GA4, 7.0.X EE, 7.1.X, Master
• Component/s: Frontend Infrastructure, Themes Infrastructure
• Labels:
  • liferay-digital-enterprise-70-sp3
  • liferay-fixpack-de-13-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Story Points: 1.5
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/47694
• Bug Type: Regression Bug

When making css changes to a theme, subsequent deployments do not show the changes in Portal.

Steps to reproduce:

1. Start a clean bundle using portal developer properties
2. Navigate to liferay-portal/modules/apps/foundation/frontend-theme/frontend-theme-classic
3. Make some styling changes to frontend-theme-classic/src/css/_custom.scss
4. Run gradle clean deploy from liferay-portal/modules/apps/foundation/frontend-theme/frontend-theme-classic

Expected result: after deployment is finished, the css changes should be applied to the page

Actual result: the theme is deployed, and no css changes can be seen on the page

Note: this does not affect js or template files, only css.