diff -up lua-5.4.0/src/lgc.c.bug8 lua-5.4.0/src/lgc.c
--- lua-5.4.0/src/lgc.c.bug8	2020-07-31 10:55:37.427116603 -0400
+++ lua-5.4.0/src/lgc.c	2020-07-31 10:57:04.639314417 -0400
@@ -856,6 +856,8 @@ static void GCTM (lua_State *L) {
     if (unlikely(status != LUA_OK)) {  /* error while running __gc? */
       luaE_warnerror(L, "__gc metamethod");
       L->top--;  /* pops error object */
+      if (isLua(L->ci))
+        L->oldpc = L->ci->u.l.savedpc;  /* update 'oldpc' */
     }
   }
 }