diff --git a/notes/psobb/ItemRT_Ep4.gsl b/notes/psobb/ItemRT_Ep4.gsl
index 4224bcdc..e0a30d8b 100755
Binary files a/notes/psobb/ItemRT_Ep4.gsl and b/notes/psobb/ItemRT_Ep4.gsl differ
diff --git a/src/Player.cc b/src/Player.cc
index 01d7e3b0..2efd53fd 100644
--- a/src/Player.cc
+++ b/src/Player.cc
@@ -101,6 +101,7 @@ void ClientGameData::create_challenge_overlay(size_t template_index, shared_ptr<
   for (size_t z = 0; z < overlay->inventory.items.size(); z++) {
     auto& i = overlay->inventory.items[z];
     i.present = 0;
+    i.unknown_a1 = 0;
     i.extension_data1 = 0;
     i.extension_data2 = 0;
     i.flags = 0;
@@ -124,6 +125,7 @@ void ClientGameData::create_challenge_overlay(size_t template_index, shared_ptr<
   for (size_t z = 0; z < tpl.items.size(); z++) {
     auto& inv_item = overlay->inventory.items[z];
     inv_item.present = tpl.items[z].present;
+    inv_item.unknown_a1 = tpl.items[z].unknown_a1;
     inv_item.flags = tpl.items[z].flags;
     inv_item.data = tpl.items[z].data;
   }
@@ -350,6 +352,7 @@ void SavedPlayerDataBB::add_item(const ItemData& item) {
   }
   auto& inv_item = this->inventory.items[this->inventory.num_items];
   inv_item.present = 1;
+  inv_item.unknown_a1 = 0;
   inv_item.flags = 0;
   inv_item.data = item;
   this->inventory.num_items++;
@@ -395,6 +398,7 @@ ItemData SavedPlayerDataBB::remove_item(uint32_t item_id, uint32_t amount, bool
   }
   auto& last_item = this->inventory.items[this->inventory.num_items];
   last_item.present = 0;
+  last_item.unknown_a1 = 0;
   last_item.flags = 0;
   last_item.data.clear();
   return ret;
diff --git a/src/PlayerSubordinates.cc b/src/PlayerSubordinates.cc
index 9eb7d53d..7eaf9b14 100644
--- a/src/PlayerSubordinates.cc
+++ b/src/PlayerSubordinates.cc
@@ -562,6 +562,7 @@ size_t PlayerInventory::remove_all_items_of_type(uint8_t data1_0, int16_t data1_
     if (!should_delete) {
       if (read_offset != write_offset) {
         this->items[write_offset].present = this->items[read_offset].present;
+        this->items[write_offset].unknown_a1 = this->items[read_offset].unknown_a1;
         this->items[write_offset].flags = this->items[read_offset].flags;
         this->items[write_offset].data = this->items[read_offset].data;
       }
@@ -809,6 +810,7 @@ const ChallengeTemplateDefinition& get_challenge_template_definition(uint32_t cl
   static auto make_template_item = +[](bool equipped, uint64_t first_data, uint64_t second_data = 0) -> PlayerInventoryItem {
     PlayerInventoryItem ret = {
         .present = 1,
+        .unknown_a1 = 0,
         .extension_data1 = 0,
         .extension_data2 = 0,
         .flags = (equipped ? 8 : 0),
diff --git a/src/PlayerSubordinates.hh b/src/PlayerSubordinates.hh
index 22002161..262df4bc 100644
--- a/src/PlayerSubordinates.hh
+++ b/src/PlayerSubordinates.hh
@@ -43,7 +43,8 @@ extern FileContentsCache player_files_cache;
 //       Unknown. These are not an array, but do appear to be related.
 
 struct PlayerInventoryItem {
-  /* 00 */ le_uint16_t present = 0;
+  /* 00 */ uint8_t present = 0;
+  /* 01 */ uint8_t unknown_a1 = 0;
   // See note above about these fields
   /* 02 */ uint8_t extension_data1 = 0;
   /* 03 */ uint8_t extension_data2 = 0;