diff --git a/exp_legacy/module/config/spawn_area.lua b/exp_legacy/module/config/spawn_area.lua
index 7f95462a..72ee8c8e 100644
--- a/exp_legacy/module/config/spawn_area.lua
+++ b/exp_legacy/module/config/spawn_area.lua
@@ -188,7 +188,7 @@ return {
                 amount = 4000,
                 size = { 26, 27 },
                 -- offset = {-64,-32}
-                offset = { -64, -64 },
+                offset = { x = -64, y = -64 },
             },
             {
                 enabled = false,
@@ -196,7 +196,7 @@ return {
                 amount = 4000,
                 size = { 26, 27 },
                 -- offset = {-64, 0}
-                offset = { 64, -64 },
+                offset = { x = 64, y = -64 },
             },
             {
                 enabled = false,
@@ -204,7 +204,7 @@ return {
                 amount = 4000,
                 size = { 22, 20 },
                 -- offset = {-64, 32}
-                offset = { -64, 64 },
+                offset = { x = -64, y = 64 },
             },
             {
                 enabled = false,
@@ -212,7 +212,7 @@ return {
                 amount = 4000,
                 size = { 22, 20 },
                 -- offset = {-64, -64}
-                offset = { 64, 64 },
+                offset = { x = 64, y = 64 },
             },
             {
                 enabled = false,
@@ -220,7 +220,7 @@ return {
                 amount = 4000,
                 size = { 22, 20 },
                 -- offset = {-64, -96}
-                offset = { 0, 64 },
+                offset = { x = 0, y = 64 },
             },
         },
     },
@@ -233,7 +233,7 @@ return {
                 num_patches = 4,
                 amount = 4000000,
                 -- offset = {-80, -12},
-                offset = { -12, 64 },
+                offset = { x = -12, y = 64 },
                 -- offset_next = {0, 6}
                 offset_next = { 6, 0 },
             },
diff --git a/exp_scenario/module/control/mine_depletion.lua b/exp_scenario/module/control/mine_depletion.lua
index 996a6019..0f54a676 100644
--- a/exp_scenario/module/control/mine_depletion.lua
+++ b/exp_scenario/module/control/mine_depletion.lua
@@ -73,8 +73,8 @@ local function try_deconstruct_output_chest(entity)
         type = { "mining-drill", "inserter" },
         to_be_deconstructed = false,
         area = {
-            { target_position.x - 1, target_position.y - 1 },
-            { target_position.x + 1, target_position.y + 1 }
+            left_top = { x = target_position.x - 1, y = target_position.y - 1 },
+            right_bottom = { x = target_position.x + 1, y = target_position.y + 1 },
         },
     }
 
@@ -251,8 +251,8 @@ local function on_resource_depleted(event)
     local drills = resource.surface.find_entities_filtered{
         type = "mining-drill",
         area = {
-            { position.x - max_mining_radius, position.y - max_mining_radius },
-            { position.x + max_mining_radius, position.y + max_mining_radius },
+            left_top = { x = position.x - max_mining_radius, y = position.y - max_mining_radius },
+            right_bottom = { x = position.x + max_mining_radius, y = position.y + max_mining_radius },
         },
     }
 
diff --git a/exp_scenario/module/control/spawn_area.lua b/exp_scenario/module/control/spawn_area.lua
index 6ac8bdf4..4d96e90c 100644
--- a/exp_scenario/module/control/spawn_area.lua
+++ b/exp_scenario/module/control/spawn_area.lua
@@ -10,8 +10,8 @@ local config = require("modules.exp_legacy.config.spawn_area")
 --- @return MapPosition.struct
 local function apply_offset(position, offset)
     return {
-        x = assert(position.x or position[1]) + assert(offset.x or offset[1]),
-        y = assert(position.y or position[2]) + assert(offset.y or offset[2])
+        x = position.x + offset.x,
+        y = position.y + offset.y,
     }
 end
 
@@ -21,8 +21,8 @@ end
 --- @param x_index number
 --- @param y_index number
 local function apply_offset_to_array(positions, offset, x_index, y_index)
-    local x = assert(offset.x or offset[1])
-    local y = assert(offset.y or offset[2])
+    local x = offset.x
+    local y = offset.y
     for _, position in ipairs(positions) do
         position[x_index] = position[x_index] + x
         position[y_index] = position[y_index] + y
diff --git a/type.patch.lua b/type.patch.lua
new file mode 100644
index 00000000..191d59d8
--- /dev/null
+++ b/type.patch.lua
@@ -0,0 +1,8 @@
+---@meta
+
+--- The api documents MapPosition and BoundingBox as a union of the named form
+--- and a positional array, because both are accepted as input. Everything read
+--- back from the game uses the named form, and we always write it that way too,
+--- so the positional variant is removed here.
+---@alias MapPosition MapPosition.struct
+---@alias BoundingBox BoundingBox.struct