From 89eba38e62981d7a6f0dd4995c603a23e00c113d Mon Sep 17 00:00:00 2001
From: Alexei Podtelezhnikov <apodtele@gmail.com>
Date: Mon, 8 Sep 2025 10:43:35 -0400
Subject: [PATCH] * src/truetype/ttinterp.c (TT_Run_Context): Reset IUP
 tracking bits.

Fixes #1353.
---
 src/truetype/ttinterp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/truetype/ttinterp.c b/src/truetype/ttinterp.c
index 378342bbb..bf440936c 100644
--- a/src/truetype/ttinterp.c
+++ b/src/truetype/ttinterp.c
@@ -7521,6 +7521,12 @@
     exec->func_round = (TT_Round_Func)Round_To_Grid;
     Compute_Funcs( exec );
 
+#ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
+    /* Reset IUP tracking bits in the backward compatibility mode. */
+    /* See `ttinterp.h' for details.                               */
+    exc->backward_compatibility &= ~0x6;
+#endif
+
     /* some glyphs leave something on the stack, */
     /* so we clean it before a new execution.    */
     exec->top     = 0;