From 8114ece18ab0262815c5fb8306c6de21fab3940e Mon Sep 17 00:00:00 2001
From: GenericHeroGuy <genericheroguy@noreply.codeberg.org>
Date: Thu, 9 Oct 2025 20:42:45 +0200
Subject: [PATCH] Don't overwrite mobj fields with defaults in write mode
 (whoops!)

---
 src/p_saveg.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/p_saveg.c b/src/p_saveg.c
index 75ddfd8da..03e4131d4 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -1023,7 +1023,8 @@ enum linediff_e
 #define GETB(b) (diff[b / (8*sizeof(*diff))] & (1 << (b & (8*sizeof(*diff) - 1))))
 #define SYNCF(b, v) if (GETB(b)) SYNC(v)
 #define SYNCFB(b, v) if (GETB(b)) SYNCBOOLEAN(v)
-#define SYNCDEF(b, v, d) (GETB(b) ? SYNC(v) : (v = d))
+// if diff includes b, sync v, else if in read mode, set v to d(efault)
+#define SYNCDEF(b, v, d) (GETB(b) ? SYNC(v) : !save->write ? (v = d) : (void)0)
 
 static boolean P_LineArgsEqual(const line_t *li, const line_t *spawnli)
 {