Getting the following error message for the wandering trader for a map recipe it seems.

[19:09:18] [Render thread/WARN]: Failed loading wandering trader
[19:09:18] [Render thread/WARN]: Exception caught when registering wandering trader
java.lang.NullPointerException: Cannot invoke "net.minecraft.world.entity.Entity.m_9236_()" because "entity" is null
at com.telepathicgrunt.repurposedstructures.misc.maptrades.StructureSpecificMaps$TreasureMapForEmeralds.m_213663_(StructureSpecificMaps.java:53) ~[repurposed_structures-7.1.15+1.20.1-forge.jar%231030!/:?]
at jeresources.collection.TradeList.addMerchantRecipe(TradeList.java:58) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.collection.TradeList.addITradeList(TradeList.java:69) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.entry.AbstractVillagerEntry.addITradeLists(AbstractVillagerEntry.java:29) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.entry.AbstractVillagerEntry.(AbstractVillagerEntry.java:22) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.entry.WanderingTraderEntry.(WanderingTraderEntry.java:16) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.util.VillagersHelper.initRegistry(VillagersHelper.java:30) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.compatibility.Compatibility.init(Compatibility.java:33) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.proxy.CommonProxy.initCompatibility(CommonProxy.java:14) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at jeresources.jei.JEIConfig.registerCategories(JEIConfig.java:98) ~[JustEnoughResources-1.20.1-1.4.0.247.jar%23895!/:1.4.0.247]
at mezz.jei.library.load.PluginLoader.lambda$createRecipeCategories$3(PluginLoader.java:91) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at mezz.jei.library.load.PluginCaller.callOnPlugins(PluginCaller.java:25) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at mezz.jei.library.load.PluginLoader.createRecipeCategories(PluginLoader.java:91) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at mezz.jei.library.load.PluginLoader.createRecipeManager(PluginLoader.java:121) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at mezz.jei.library.startup.JeiStarter.start(JeiStarter.java:130) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at mezz.jei.forge.startup.StartEventObserver.transitionState(StartEventObserver.java:130) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at mezz.jei.forge.startup.StartEventObserver.restart(StartEventObserver.java:109) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at mezz.jei.forge.startup.StartEventObserver.onEvent(StartEventObserver.java:96) ~[jei-1.20.1-forge-15.12.3.55.jar%23889!/:15.12.3.55]
at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:260) ~[eventbus-6.0.5.jar%2387!/:?]
at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:252) ~[eventbus-6.0.5.jar%2387!/:?]
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:315) ~[eventbus-6.0.5.jar%2387!/:?]
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:296) ~[eventbus-6.0.5.jar%2387!/:?]
at net.minecraftforge.client.ForgeHooksClient.onRecipesUpdated(ForgeHooksClient.java:717) ~[forge-1.20.1-47.3.6-universal.jar%231141!/:?]
at net.minecraft.client.multiplayer.ClientPacketListener.m_6327_(ClientPacketListener.java:1354) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.network.protocol.game.ClientboundUpdateRecipesPacket.m_5797_(ClientboundUpdateRecipesPacket.java:32) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.network.protocol.game.ClientboundUpdateRecipesPacket.m_5797_(ClientboundUpdateRecipesPacket.java:14) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.network.protocol.PacketUtils.m_263899_(PacketUtils.java:22) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:156) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.m_6367_(ReentrantBlockableEventLoop.java:23) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:130) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.util.thread.BlockableEventLoop.m_18699_(BlockableEventLoop.java:115) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1106) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20.1-20230612.114412-srg.jar%231136!/:?]
at net.minecraft.client.main.Main.main(Main.java:218) ~[forge-47.3.6.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?]
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.3.6.jar:?]
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:99) ~[fmlloader-1.20.1-47.3.6.jar:?]
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$makeService$0(CommonClientLaunchHandler.java:25) ~[fmlloader-1.20.1-47.3.6.jar:?]
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar:?]
at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar:?]
at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?]
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?]
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?]
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?]

Jei resources may be passing a null entity to the trade system which crashes. They will likely need to adjust their code. See if there is a report already on JER repo

yeah I don't think this is an RS issue. More likely to be JER