MV

adapters/modded-common/src/main/java/art/arcane/iris/modded/ModdedIrisLog.java

@@ -35,9 +35,13 @@ public final class ModdedIrisLog {
         LogLevel target = level == null ? LogLevel.INFO : level;
         switch (target) {
             case DEBUG -> debug(message);
-            case INFO -> info(message);
             case WARN -> warn(message);
             case ERROR -> error(message);
+            // INFO, NOTICE, and any level added later. This is a switch statement, so the compiler does not
+            // check it for exhaustiveness and a missing arm would drop the message silently. The modded
+            // loaders have one logger, so a lifecycle notice is already in the file the server writes; the
+            // level only differs on Bukkit, where INFO goes to a console sender instead.
+            default -> info(message);
         }
     }
 

adapters/modded-common/src/test/java/art/arcane/iris/modded/ModdedIrisLogLevelCoverageTest.java

@@ -0,0 +1,27 @@
+package art.arcane.iris.modded;
+
+import org.junit.Test;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.Assert.assertTrue;
+
+/**
+ * The level router is a switch statement, which the compiler does not check for exhaustiveness. A level added
+ * to {@link art.arcane.iris.spi.LogLevel} with no arm here would compile and then drop every message at that
+ * level without a trace, so the fallback arm is what keeps a new level visible on the modded loaders.
+ */
+public class ModdedIrisLogLevelCoverageTest {
+    @Test
+    public void everyLogLevelReachesTheLoggerIncludingOnesAddedLater() throws IOException {
+        String source = Files.readString(Path.of(System.getProperty("iris.moddedCommonSources"),
+                "art/arcane/iris/modded/ModdedIrisLog.java"));
+        int router = source.indexOf("public static void log(LogLevel level, String message)");
+        assertTrue("log(LogLevel, String) not found", router >= 0);
+
+        String body = source.substring(router, source.indexOf("public static void debug(", router));
+        assertTrue(body, body.contains("default -> info(message);"));
+    }
+}