Bug: overworld sprite did not update after Fusion

When I was fusing Phase Knight with Chaos Guard and picked the fourth color palette, the overworld sprite did not update. This was yesterday. Today I started up Siralim again and the overworld sprite is correct.

Maybe the game did not refresh the overworld sprite, but it did when it loaded my party after starting up the game a second time?

Warm regards,
KaaaaasKop.