diff --git a/spec/System/TestModStore_spec.lua b/spec/System/TestModStore_spec.lua
new file mode 100644
index 0000000000..d46fb4f3b3
--- /dev/null
+++ b/spec/System/TestModStore_spec.lua
@@ -0,0 +1,10 @@
+describe("ModStore source filter", function()
+	it("selects mods without filtering what their tags read", function()
+		local modDB = new("ModDB"):ModDB()
+		modDB:NewMod("Multiplier:Socket", "BASE", 1, "Item Sockets")
+		modDB:NewMod("Life", "INC", 12, "Tree:1", { type = "Multiplier", var = "Socket" })
+		modDB:NewMod("Life", "INC", 30, "Item:1")
+
+		assert.are.equals(12, modDB:Sum("INC", { source = "Tree" }, "Life"))
+	end)
+end)
diff --git a/src/Classes/ModStore.lua b/src/Classes/ModStore.lua
index 0dd30e41d6..e7c4b46ac5 100644
--- a/src/Classes/ModStore.lua
+++ b/src/Classes/ModStore.lua
@@ -361,6 +361,11 @@ end
 ---@param globalLimits? table
 ---@return any
 function ModStoreClass:EvalMod(mod, cfg, globalLimits)
+	-- cfg.source only selects which mods a query reads. Multipliers and conditions read by tags can come from any source.
+	if cfg and cfg.source then
+		cfg = copyTable(cfg, true)
+		cfg.source = nil
+	end
 	local value = mod.value
 	local GetStat = self.GetStat
 	local GetMultiplier = self.GetMultiplier