Count skipped checkpoints when jumping past them

src/main/java/eu/mhsl/minecraft/endlessjumper/generator/JumpGenerator.java

@@ -145,9 +145,11 @@ public class JumpGenerator {
             this.player.showTitle(Title.title(Component.empty(), Component.text(this.combo, COMBO_COLOR)));
         }
 
-        if(isCheckpoint(index)) {
-            this.checkpoint = this.step(index).pos();
-            Progress.save(this.player.getUuid(), index);
+        // auch ein übersprungener Checkpoint zählt: der letzte zwischen altem und neuem Stand
+        int reachedCheckpoint = index / 10 * 10;
+        if(reachedCheckpoint > previous) {
+            this.checkpoint = this.step(reachedCheckpoint).pos();
+            Progress.save(this.player.getUuid(), reachedCheckpoint);
             this.player.playSound(CHECKPOINT_SOUND);
             this.player.showTitle(CHECKPOINT_TITLE);
             this.player.sendPacket(new ParticlePacket(Particle.CRIT, this.checkpoint, this.checkpoint.add(0.5), 1.5f, 50));