The build() method of a breadcrumb builder gets given a $route_match parameter, presumably to use to create the breadcrumb.
However, PathBasedBreadcrumbBuilder completely ignores that and instead gets the actual current path from the context:
$path = trim($this->context->getPathInfo(), '/');
This means that PathBasedBreadcrumbBuilder can't be used in any other contexts, for example to create the breadcrumb for another route to use as the basis for another breadcrumb builder.
Needs work
11.0 🔥
system.module
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Extension to #9. While using #9 to call build() function from controller I was getting leaked cache metadeta error.
Re-rolled patch 2884217-9.patch → against 11.x and updated test.