in src/main/java/org/apache/sling/jcr/presence/internal/UserPresenter.java [203:209]
private boolean matches(@NotNull final Map<String, String> properties) {
final String authorizableId = properties.get(REP_AUTHORIZABLE_ID);
if (userId.equals(authorizableId)) {
return isNodeUserOrSystemUser(properties); // extra check
}
return false;
}