[Issue] Plugin not working in Paper (with PluginRemapper)

[agubarra]

Describe the bug

Console error:

[18:12:40] [Paper Plugin Remapper Thread - 1/INFO]: [PluginRemapper] Remapping plugin 'plugins/AdvancedMobs-1.15.13.jar'...
[18:12:41] [ServerMain/ERROR]: [PluginRemapper] Encountered exception remapping plugins
java.util.concurrent.CompletionException: java.lang.RuntimeException: Failed to remap plugin jar 'plugins/AdvancedMobs-1.15.13.jar'
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:649) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?]
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.RuntimeException: Failed to remap plugin jar 'plugins/AdvancedMobs-1.15.13.jar'
	at io.papermc.paper.pluginremap.PluginRemapper.lambda$remap$7(PluginRemapper.java:358) ~[paper-1.21.4.jar:1.21.4-118-73f7736]
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646) ~[?:?]
	... 4 more
Caused by: java.lang.IllegalStateException: Duplicate entries detected: net/advancedplugins/mobs/impl/commons/effects/mechanics/triggers/internal/HoldItemTrigger.class, net/advancedplugins/mobs/impl/commons/effects/variables/StaticVariable.class, net/advancedplugins/mobs/impl/utils/items/ItemFlagFix.class
	at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:191) ~[paper-1.21.4.jar:?]
	at net.neoforged.art.internal.RenamerImpl.run(RenamerImpl.java:79) ~[paper-1.21.4.jar:?]
	at io.papermc.paper.pluginremap.PluginRemapper.lambda$remap$7(PluginRemapper.java:355) ~[paper-1.21.4.jar:1.21.4-118-73f7736]
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646) ~[?:?]
	... 4 more

How to reproduce

Install last version of paper, install the plugin and run the server

Screenshots / Videos

No response

Server Log

https://mcpaste.io/ad3e0430529c7544