In OidcCookieTokenStore#getContextPath, we can see that new URIBuilder(uri).build().getPath(); is called. The value of this should be assigned to the path variable. Currently, the value computed here isn't getting used.

See https://github.com/wildfly-security/wildfly-elytron/blob/1.x/http/oidc/src/main/java/org/wildfly/security/http/oidc/OidcCookieTokenStore.java#L190.