• This issue is not solved in a development build

Describe the bug
When a plugin registers a ProtocolLib sending listener on PacketType.Play.Server.BUNDLE with ListenerPriority.MONITOR, ProtocolLib throws IllegalStateException: The packet event is read-only. during outbound processing.

To Reproduce
Steps to reproduce the behavior:

1. Register a PacketAdapter for sending with ListenerPriority.MONITOR and include PacketType.Play.Server.BUNDLE in the whitelist (or use PacketType.values()).
2. Trigger normal gameplay actions that cause bundled outbound packets. (In my case, just cancel the PlayerItemConsumeEvent)

Expected behavior
ProtocolLib should not attempt to cancel a read-only event, or should avoid this MONITOR/read-only conflict in the internal BUNDLE handling path.

Version Info
https://just-paste.it/Qk2807a7dp

Additional context
Code: https://just-paste.it/Nx2il2q2ri