Discord chat both-sided when?

[MineTurtlee]

Chatting in Minecraft gives this log and no messages in the console
[14:14:12 ERROR]: Could not pass event AsyncPlayerChatEvent to EssentialsChat v2.21.0-dev+150-e1091d8 java.util.UnknownFormatConversionException: Conversion = 'l' at org.bukkit.event.player.AsyncPlayerChatEvent.setFormat(AsyncPlayerChatEvent.java:105) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?] at EssentialsXChat-2.21.0-dev+150-e1091d8.jar/com.earth2me.essentials.chat.processing.AbstractChatHandler.handleChatFormat(AbstractChatHandler.java:122) ~[EssentialsXChat-2.21.0-dev+150-e1091d8.jar:?] at EssentialsXChat-2.21.0-dev+150-e1091d8.jar/com.earth2me.essentials.chat.processing.ChatHandler$ChatLowest.onPlayerChat(ChatHandler.java:26) ~[EssentialsXChat-2.21.0-dev+150-e1091d8.jar:?] at com.destroystokyo.paper.event.executor.MethodHandleEventExecutor.execute(MethodHandleEventExecutor.java:44) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.adventure.ChatProcessor.post(ChatProcessor.java:378) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at io.papermc.paper.adventure.ChatProcessor.process(ChatProcessor.java:85) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at net.minecraft.server.network.ServerGamePacketListenerImpl.chat(ServerGamePacketListenerImpl.java:2497) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at net.minecraft.server.network.ServerGamePacketListenerImpl.broadcastChatMessage(ServerGamePacketListenerImpl.java:2613) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChat$9(ServerGamePacketListenerImpl.java:2261) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at net.minecraft.util.FutureChain.lambda$append$1(FutureChain.java:25) ~[paper-1.21.4.jar:1.21.4-12-c17ef64] at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:718) ~[?:?] at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?] at java.base/java.lang.Thread.run(Thread.java:1570) ~[?:?]

but chatting through discord works:

No initialization bugs found in the boot log?

[Evidentsinger14]

This error is typically thrown when you try to use PlaceholderAPI in your EssentialsXChat format. we don't support PlaceholderAPI in that module, so that's not going to work.
For future reference, support is provided in MOSS. Discussions are rarely checked.