The Bug:

The jigsaw interface doesn't have a title.

The command block and structure block interfaces have titles therefore introducing an inconsistency.

Steps to Reproduce:

1. Place down a jigsaw block and open it.
2. Observe if the jigsaw interface has a title.

Observed Behavior:

The jigsaw interface doesn't have a title.

Expected Behavior:

The jigsaw interface would have a title.