The "B-20 Witch Broom Cannon" was already craftable even before completing the "Sniper Turret (Uranium Slug Turret)" research. (It becomes craftable as soon as "Gunsmithing" is completed.)

After investigating, I found that the position of "researchPrerequisites" in ThingDef "BM_B20WITCH" might be incorrect.

I moved "researchPrerequisites" inside "recipeMaker", and it started functioning correctly.

I hope this helps!

似乎是“大型机械卡宾枪”这个武器出现了问题

XML error: <weaponTags><li>CE_AI_AR</li><li>NoSwitch</li></weaponTags> doesn't correspond to any field in type PatchOperationReplace. Context: <li Class="PatchOperationReplace"><xpath>Defs/ThingDef[defName="BM_LargeMechCarbine"]/tools</xpath><value><tools><li Class="CombatExtended.ToolCE"><label>stock</label><capacities><li>Blunt</li></capacities><power>8</power><cooldownTime>1.55</cooldownTime><chanceFactor>1.5</chanceFactor><armorPenetrationBlunt>2.755</armorPenetrationBlunt><linkedBodyPartsGroup>Stock</linkedBodyPartsGroup></li><li Class="CombatExtended.ToolCE"><label>barrel</label><capacities><li>Blunt</li></capacities><power>5</power><cooldownTime>2.02</cooldownTime><armorPenetrationBlunt>1.630</armorPenetrationBlunt><linkedBodyPartsGroup>Barrel</linkedBodyPartsGroup></li></tools></value><weaponTags><li>CE_AI_AR</li><li>NoSwitch</li></weaponTags></li>
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
Verse.DirectXmlToObject:ObjectFromXml<Verse.PatchOperation> (System.Xml.XmlNode,bool)
Verse.DirectXmlToObject:ListFromXml<Verse.PatchOperation> (System.Xml.XmlNode)
Verse.DirectXmlToObject:ListFromXmlReflection<Verse.PatchOperation> (System.Xml.XmlNode)
Verse.DirectXmlToObject:ObjectFromXml<System.Collections.Generic.List`1<Verse.PatchOperation>> (System.Xml.XmlNode,bool)
Verse.DirectXmlToObject:ObjectFromXmlReflection<System.Collections.Generic.List`1<Verse.PatchOperation>> (System.Xml.XmlNode,bool)
Verse.DirectXmlToObject:ObjectFromXml<Verse.PatchOperation> (System.Xml.XmlNode,bool)
Verse.DirectXmlToObject:ObjectFromXmlReflection<Verse.PatchOperation> (System.Xml.XmlNode,bool)
Verse.DirectXmlToObject:ObjectFromXml<Verse.PatchOperation> (System.Xml.XmlNode,bool)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.ModContentPack.LoadPatches_Patch1 (Verse.ModContentPack)
Verse.ModContentPack:get_Patches ()
Verse.LoadedModManager:ErrorCheckPatches ()
Verse.LoadedModManager:LoadAllActiveMods (bool)
Verse.PlayDataLoader:DoPlayLoad ()
Verse.PlayDataLoader:LoadAllPlayData (bool)
Verse.Root/<>c:<Start>b__6_1 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__28_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()