Resolve direct advanced Sneak arrivals

game/engine.ts

@@ -27887,6 +27887,9 @@ function sneakAttackOptions(
   let blocked: string | null = null;
   try {
     allowedEntry(g, owner, entry.territory, entry.sector);
+    if (g.advanced && (entry.resume === 'wormRide' || g.pendingArrivalOverlap?.resume === 'wormRide' ||
+      g.pendingAmbassador?.resume === 'wormRide'))
+      blocked = 'Sneak Attack during a worm ride needs its original ride continuation; send no forces or leave the token hidden.';
   } catch (error) {
     if (!(error instanceof RuleError)) throw error;
     blocked = error.message;
@@ -28168,7 +28171,10 @@ function decideTerror(g: Game, p: Player, action: Action) {
     const revivalArrival: RevivalEntryParent | undefined = amount > 0 && entry.revivalArrival
       ? {event:entry.revivalArrival.event,terror:{event:entry.entrySignature!,owner:p.id,
         territory:entry.territory,sector:entry.sector,amount,elite:0}} : undefined;
-    const advancedNativeOverlap = g.advanced && bareAdvancedNativeArrivalOverlap(g) && !!g.pendingArrivalOverlap;
+    // Worm continuations can advance the phase synchronously; their child
+    // arrival needs a separate retained worm cursor before it can be queued.
+    const advancedNativeArrival = g.advanced && entry.resume !== 'wormRide' &&
+      g.pendingArrivalOverlap?.resume !== 'wormRide' && g.pendingAmbassador?.resume !== 'wormRide';
     if (caladan) (g.homeworldVictoryReinforcement!.terrorArrivals ??= []).push(caladan.receipt);
     finishTerrorEntry(g);
     if (caladan) {
@@ -28185,7 +28191,7 @@ function decideTerror(g: Game, p: Player, action: Action) {
         phase:g.phase,revivalArrival,revivalSneakAdvisor:true});
       return;
     }
-    if (amount > 0 && (advancedNativeOverlap || !g.advanced &&
+    if (amount > 0 && (advancedNativeArrival || !g.advanced &&
       (g.pendingArrivalOverlap || g.pendingAmbassador || g.pendingTerrorEntry || g.response || g.decision))) {
       // The child may have opened the original Terror decision. Let it finish
       // before offering advisor reactions for this already-committed group.