Chat chain breaks when chat thread pool max size = 1

Expected behavior

not get kicked when chatting

Observed/Actual behavior

chat chain is broken and players get kicked

Steps/models to reproduce

1. Set misc.chat-threads.chat-executor-max-size to 1 in config/paper-global.yml
2. Start the server, join and try to chat. The first message sent will trigger an exception and a stack trace will be shown from the chat thread pool, following messages will kick the player

Plugin and Datapack List

N/A

Paper version

Paper version 1.20.6-115-master@9d6f2cc

Other

[23:23:33] [User Authenticator #0/INFO]: UUID of player emilyy_dev is 33ae6cd1-f352-45b1-8a98-39ede5284d5e
[23:23:33] [Server thread/INFO]: emilyy_dev joined the game
[23:23:33] [Server thread/INFO]: emilyy_dev[/127.0.0.1:50710] logged in with entity id 240 at ([world]-98.96601467549034, 100.0, 705.1372853987785)
[23:23:37] [Async Chat Thread - #0/ERROR]: Chain link failed, continuing to next one
java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.CompletableFuture$UniAccept@7279a2b7 rejected from java.util.concurrent.ThreadPoolExecutor@3bfe979d[Running, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 2]
	at java.base/java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2081) ~[?:?]
	at java.base/java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:841) ~[?:?]
	at java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1376) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$UniCompletion.claim(CompletableFuture.java:572) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1773) ~[?:?]
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
[23:23:39] [Server thread/INFO]: emilyy_dev lost connection: Server closed
[23:23:39] [Server thread/INFO]: emilyy_dev left the game

Reproduce the failure by setting misc.chat-threads.chat-executor-max-size to 1 in config/paper-global.yml and sending chat messages. Start from the RejectedExecutionException and the “Chain link failed” trace in the async chat thread pool. Done means chat messages no longer break the chain or kick the player with this setting.