Container unhealthy due to ping failures - Paper 1.19.4 on image 2025.12.1

### Describe the problem

The latest image (2025.12.1) was throwing the following error for me and showing unhealthy status for the container. This is on Paper 1.19.4. Rolling back to image 2025.12.0 fixes it.

`failed to ping localhost:25565 : Received invalid packet. Expected #0, got #26`

### Container definition

```
docker run -d \
--name minecraft \
--cpus="2.0" \
-p 25565:25565 \
-p 8123:8123 \
-v /home/ubuntu/minecraft:/data \
-e EULA=TRUE \
-e SERVER_NAME=xxx \
-e ENABLE_RCON=true \
-e MOTD="xxx" \
-e DIFFICULTY=hard \
-e ENABLE_WHITELIST=true \
-e ENFORCE_WHITELIST=true \
-e WHITELIST=xxx \
-e OPS=xxx \
-e FORCE_GAMEMODE=true \
-e GENERATE_STRUCTURES=true \
-e ANNOUNCE_PLAYER_ACHIEVEMENTS=true \
-e ONLINE_MODE=true \
-e SEED="-6467775105471627794" \
-e SPAWN_PROTECTION=1 \
-e PVP=true \
-e TZ=America/New_York \
-e MEMORY=5G \
-e TYPE=PAPER \
-e USE_AIKAR_FLAGS=true \
-e VERSION=1.19.4 \
-e ENABLE_AUTOPAUSE=false \
-e UID=1001 \
-e GID=1001 \
--restart=always \
itzg/minecraft-server
```

### Container logs

```
failed to ping localhost:25565 : Received invalid packet. Expected #0, got #26
```

Start by comparing image 2025.12.1 with the working 2025.12.0 and inspect the container health check that pings localhost:25565. Reproduce with Paper 1.19.4 using the provided docker run configuration, then verify that the container reports healthy without the invalid-packet error.

Written by the indexing model from the issue text.