Fix addPassenger for Marker (#7762)

patches/server/CB-fixes.patch

@@ -8,6 +8,8 @@ Subject: [PATCH] CB fixes
 
 * Removed incorrect parent perm for `minecraft.debugstick.always`
 
+* Fixed method signature of Marker#addPassenger
+
 diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -21,6 +23,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          this.structureFeatureManager = new StructureFeatureManager(this, this.serverLevelData.worldGenSettings(), this.structureCheck); // CraftBukkit
          if (this.dimensionType().createDragonFight()) {
              this.dragonFight = new EndDragonFight(this, this.serverLevelData.worldGenSettings().seed(), this.serverLevelData.endDragonFightData()); // CraftBukkit
+diff --git a/src/main/java/net/minecraft/world/entity/Marker.java b/src/main/java/net/minecraft/world/entity/Marker.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/entity/Marker.java
++++ b/src/main/java/net/minecraft/world/entity/Marker.java
+@@ -0,0 +0,0 @@ public class Marker extends Entity {
+     }
+ 
+     @Override
+-    protected void addPassenger(Entity passenger) {
++    protected boolean addPassenger(Entity passenger) { // Paper - fix upstream
+         passenger.stopRiding();
++        return false; // Paper - fix upstream
+     }
+ 
+     @Override
 diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java b/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java