What happened?

Steps to reproduce

1. Enable the System - Page Cache plugin (page caching on).
2. Make sure you are logged out (guest).
3. Visit an article that belongs to a category, so its breadcrumb path gets cached.
4. Now visit the category page of that same category as a guest.

Version

6.1

Expected result

The Breadcrumbs module shows the path for the category page (e.g. Home / Category).

Actual result

The Breadcrumbs module shows the path of a previously cached article inside that category (e.g. Home / Category / Some Article), so the category page displays an arbitrary sub-path that does not match the current page.

System Information

Joomla version: 6.1.2
PHP version: 8.4
Cache handler / settings: ON, conservative Caching
Browser: Firefox in my case

Additional Comments

Logged-in users are not affected, the breadcrumb path is correct for them.
The issue only appears with Page Cache enabled. With caching off, the breadcrumb is correct.