How to Avoid the Game-Breaking Index Page Bug in Yoshi and the Mysterious Book

To trigger the bug, a player must do the following:

1. Begin the "Bewilder Bird" investigation early. This must happen before hearing Mr. E’s tutorial explanation of the Index, which normally plays after you complete a total of four chapters .
2. Complete that investigation without a major discovery. The player must finish researching the Bewilder Bird but end the investigation before uncovering any significant findings .
3. Listen to the Index tutorial afterward. Once the player reaches the point after Chapter 4 and hears the Index tutorial that was skipped earlier, the game soft-locks. At this point, leaving the Index page becomes impossible .

How to avoid the bug until a patch arrives

The workaround is straightforward: Do not research the Bewilder Bird before you hear Mr. E’s Index tutorial. The tutorial triggers naturally after you clear the first four chapters. Avoiding the Bewilder Bird investigation entirely until that moment should prevent the lock from ever occurring .

If you have already started the Bewilder Bird investigation before the tutorial, ensure you make a major discovery before finishing it, or reload an earlier save to undo the sequence.

Nintendo’s response

Nintendo addressed the issue through its customer support channels on May 29, 2026, citing multiple user reports . The company stated it is "currently preparing an update" to resolve the bug, and promised more information when the patch is ready . Nintendo apologized for the inconvenience and asked players for patience .

No specific release date for the patch has been shared. Until it arrives, the manual workaround remains the only protection.