1.21.8 - Respawn Anchor is not returning the player who made explote it on PlayerDeathEvent

Expected behavior

When you kill somebody with Respawn Anchor and you use PlayerDeathEvent to get the killer, it should return the Player who made it, for now im using BlockPlaceEvent to check what was here before and who place it, but as other things such as tnt, end crystal returns the player but for some reason not for respawn anchor

Observed/Actual behavior

if you kill a player with the below code, using a anchor it returns this:

[10:23:41 INFO]: [Is_System32_: Set own game mode to Survival Mode]
[10:23:43 INFO]: Is_System32_ has made the advancement [Not Quite "Nine" Lives]
[10:23:43 INFO]: CraftDamageType{holder=Reference{ResourceKey[minecraft:damage_type / minecraft:bad_respawn_point]=DamageType[msgId=badRespawnPoint, scaling=ALWAYS, exhaustion=0.1, effects=HURT, deathMessageType=INTENTIONAL_GAME_DESIGN]}}
[10:23:43 INFO]: Is_System32_ was killed by [Intentional Game Design]

Using a tnt or end crystal returns this, also you can use DamageSource.directEntity to check if it was a tnt or a end crystal

[10:24:00 INFO]: [Is_System32_: Set own game mode to Survival Mode]
[10:24:02 INFO]: CraftDamageType{holder=Reference{ResourceKey[minecraft:damage_type / minecraft:player_explosion]=DamageType[msgId=explosion.player, scaling=ALWAYS, exhaustion=0.1, effects=HURT, deathMessageType=DEFAULT]}}
[10:24:02 INFO]: Is_System32_ death by player: Is_System32_, item used: END_CRYSTAL, isExplosion: true
[10:24:02 INFO]: Is_System32_ was blown up by Is_System32_

TNT:

[10:24:19 INFO]: [Is_System32_: Set own game mode to Survival Mode]
[10:24:24 INFO]: CraftDamageType{holder=Reference{ResourceKey[minecraft:damage_type / minecraft:player_explosion]=DamageType[msgId=explosion.player, scaling=ALWAYS, exhaustion=0.1, effects=HURT, deathMessageType=DEFAULT]}}
[10:24:24 INFO]: Is_System32_ death by player: Is_System32_, item used: FLINT_AND_STEEL, isExplosion: true
[10:24:24 INFO]: Is_System32_ was blown up by Is_System32_

Steps/models to reproduce

@EventHandler(priority = EventPriority.HIGHEST)
    fun onPlayerDeathEvent(event: PlayerDeathEvent) {
        if (event.isCancelled) return
        val victim = event.entity
        val source = victim.lastDamageCause?.damageSource ?: return
        println(source.damageType)
        val killer = (source.causingEntity ?: return) as? Player ?: return
        val itemUsed = killer.inventory.itemInMainHand.type
        val isExplotion = source.damageType == DamageType.PLAYER_EXPLOSION
        println("${victim.name} death by player: ${killer.name}, item used: $itemUsed, isExplosion: $isExplotion")
    }

Plugin and Datapack List

[10:31:30 INFO]: ? Server Plugins (4):
[10:31:30 INFO]: Bukkit Plugins:
[10:31:30 INFO]: - DecentHolograms, FenixRankedSystem, PlaceholderAPI, SkinsRestorer

Paper version

[10:31:45 INFO]: This server is running Paper version 1.21.8-49-main@614e9ac (2025-08-23T21:22:35Z) (Implementing API version 1.21.8-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.8-40-f866a5f (MC: 1.21.8)

Other

No response

Start with the PlayerDeathEvent damage-source path for respawn-anchor explosions and compare how causingEntity is assigned for TNT and end crystals. Add or run a regression test covering PlayerDeathEvent and DamageSource.causingEntity, verifying that the player who triggered the anchor is returned.