Silent Basic let me access resource without credential

I use this configuration in web.xml <auth-method>BASIC?silent=true,FORM</auth-method> and I get 200 + content of protected resource when I access resource without credentials.

If I use this configuration in web.xml <auth-method>BASIC?silent=true</auth-method> I get correctly empty content with 200 status code when I access without credentials.

Zulip Chat 2019-01-04: https://wildfly.zulipchat.com/#narrow/stream/174178-eap/subject/EAP7-1154.20HTTP.20Basic.20Silent.20Operation

Test Commit: https://github.com/mchoma/wildfly/commit/e191c211c7e224f835c933c31829e59777aa4008