--- a/Game/src/gamedef.c
+++ b/Game/src/gamedef.c
@@ -2937,7 +2937,12 @@
             parseifelse( (( hittype[g_i].floorz - hittype[g_i].ceilingz ) >> 8 ) < *insptr);
             break;
         case 63:
-            parseifelse( sync[g_p].bits&(1<<29));
+            /* Modern bindings put Jump on Space. Accept it for restart only
+             * when this script belongs to the dead player; living actor
+             * interactions must remain Open-only. */
+            parseifelse(sync[g_p].bits &
+                ((g_sp->picnum == APLAYER && g_sp->extra <= 0)
+                    ? ((1u << 29) | 1u) : (1u << 29)));
             break;
         case 64:
             parseifelse(sector[g_sp->sectnum].ceilingstat&1);