[1.16.5] ItemsAdder v3.6.3 报错无法加载变量

[anxge]

运行环境

Minecraft版本(1.12.2/1.16.5/1.18.2):
构建版本(从/version指令获取):
相关模组/插件: This server is running CatServer version 1.16.5-69069a9c (MC: 1.16.5) (Implementing API version 1.16.5-R0.1-SNAPSHOT, Forge version 36.2.39)

描述这个BUG
(如果有报错请附上pastebin链接或上传日志文件)
加载报错

[00:11:00] [Server thread/WARN]: [ItemsAdder] Task #12066 for ItemsAdder v3.6.3-beta-14 generated an exception
 java.lang.UnsupportedOperationException: null
        at com.google.common.collect.ImmutableCollection.removeIf(ImmutableCollection.java:270) ~[server-1.16.5-20210115.111550-extra.jar:?]
        at ia.m.nR.cs(SourceFile:292) ~[?:?]
        at ia.m.fN.bL(SourceFile:22) ~[?:?]
        at ia.m.ft.a(SourceFile:476) ~[?:?]
        at ia.m.G.a(SourceFile:930) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftTask.run(CraftTask.java:81) ~[forge:?]
        at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:400) ~[forge:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:997) ~[?:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:336) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:943) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:775) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:265) ~[?:?]
        at java.lang.Thread.run(Thread.java:831) [?:?]

导致的问题r
ia变量无法使用
复现方法
正常加载
截图/视频
(如果没有可以忽略)