If the frontend cache is enabled and the cached resource is available (and returned) then the site helper adds a 404 HTTP response code.
This happens in the onIsDispatchable method after testing a event value that probably need to be set before by onIsDispatchable method of the Linked Data plugin (checking if the requested resource is available in the knowledge base). Problem: the method of the Linked Data plugin is executed after the SIte Extension helper method.
If the frontend cache is enabled and the cached resource is available (and returned) then the site helper adds a 404 HTTP response code.
This happens in the onIsDispatchable method after testing a event value that probably need to be set before by onIsDispatchable method of the Linked Data plugin (checking if the requested resource is available in the knowledge base). Problem: the method of the Linked Data plugin is executed after the SIte Extension helper method.