Prevent Link from using masks on Minish tiles

Masks/minish_form.asm

@@ -1,14 +1,13 @@
-; =============================================================================
+; =========================================================
 ; Minish Form Link
 ; 
 ; Reacts to Tile ID 64 to transform into Minish Link
-; =============================================================================
+; =========================================================
 
 org    $398000
 incbin gfx/minish_link.4bpp
 
-; =============================================================================
-
+; =========================================================
 org    $07DA2A
   TileDetection_OverworldAttributeJumpTable:
 
@@ -18,16 +17,29 @@ org $07DAF2
   dw LinkState_CheckForMinishForm ; Tile ID 64
   dw LinkState_CheckMinishTile    ; Tile ID 65
 
-; =============================================================================
-
+; =========================================================
 ; Start of free space in bank 07
 org $07F89D
 LinkState_CheckForMinishForm:
 {
   SEP #$30
+
   ; Check for the R button (like minish cap)
   %CheckNewR_ButtonPress() : BEQ .return
 
+  ; Skip the code if you have a mask item out
+  LDA $0202
+
+  ; Check if the value in A (from $0202) is LT $13.
+  CMP.b #$13 : BCC .continue
+
+  ; Check if the value in A (from $0202) is GTE to $16.
+  CMP.b #$17 : BCS .continue
+
+  JMP .return
+
+.continue
+
   LDA   !CurrentMask
   CMP.b #$05 : BEQ .already_minish ; return to human form
   CMP.b #$00 : BNE .return         ; don't transform if not human
@@ -43,7 +55,7 @@ LinkState_CheckForMinishForm:
 .already_minish
   %PlayerTransform()
   %ResetToLinkGraphics()
-  LDA $0AAF : STA.l $7EF35A
+  LDA $0AAF : STA.l $7EF35A ; restore the shield 
 
 .return
   REP #$30