Timestamp checks prevent viewing of older .css files

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Fix Version/s: 7.0.0 DXP FP86, 7.0.10.12 DXP SP12, 7.0.X, 7.1.10 DXP FP10, 7.1.10.2 SP2, 7.1.3 CE GA4, 7.1.X, Master
• Component/s: Frontend Infrastructure
• Labels:
  • QA-V
  • ee-ts
  • liferay-dxp-70-sp12
  • liferay-dxp-71-sp2
  • liferay-fixpack-de-86-7010
  • liferay-fixpack-dxp-10-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/71052

Steps to reproduce

1. Add theme.css.fast.load=false to portal-ext.properties
2. Start up your Liferay bundle
3. Copy v1/demo-css-update.jar to your deploy folder and wait for deployment to complete
4. Add the Demo CSS Update portlet to the page, and confirm that the first row has a red background
5. Copy v2/demo-css-update.jar to your deploy folder and wait for deployment to complete
6. Clear your browser cache, refresh the page, and confirm that the first row has a black background (if it has a red background, you've reproduced the issue early)
7. Restart your Liferay bundle without clearing the Tomcat work folder
8. Clear your browser cache, refresh the page, and confirm that the first row still has a black background
9. Copy v1/demo-css-update.jar to your deploy folder and wait for deployment to complete
10. Clear your browser cache, refresh the page

Expected behavior is that the first row returns to having a red background.
Actual behavior is that it still has a black background.