Relic Music Disc emits redstone signal strength of 15, instead of 14

The Relic Music Disc emits redstone signal strength of 15, instead of 14, which doesn't match Java Edition.

Steps to Reproduce

1. Put a jukebox, a comparator, and 15 redstone dusts to make a line.
2. Play the Relic Music Disc.
3. Pay attention on how long the signal travels.

Expected Result
The signal strengths of Relic is 14.

Observed Result
The signal strengths of Relic is 15.