Add validation for player start entity input bindings (keyboard and gamepad)

src/document/scene-document-validation.ts

@@ -2996,6 +2996,19 @@ function validatePlayerStartEntity(
     );
   }
 
+  if (
+    !isPlayerStartKeyboardBindingCode(entity.inputBindings?.keyboard.interact)
+  ) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-player-start-interact-keyboard-binding",
+        "Player Start interact keyboard binding must be a supported key or mouse code.",
+        `${path}.inputBindings.keyboard.interact`
+      )
+    );
+  }
+
   if (
     !isPlayerStartKeyboardBindingCode(entity.inputBindings?.keyboard.pauseTime)
   ) {
@@ -3092,6 +3105,19 @@ function validatePlayerStartEntity(
     );
   }
 
+  if (
+    !isPlayerStartGamepadActionBinding(entity.inputBindings?.gamepad.interact)
+  ) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-player-start-interact-gamepad-binding",
+        "Player Start interact gamepad binding must be a supported standard-gamepad action input.",
+        `${path}.inputBindings.gamepad.interact`
+      )
+    );
+  }
+
   if (
     !isPlayerStartGamepadActionBinding(entity.inputBindings?.gamepad.pauseTime)
   ) {