How to extend a sexlab scene stage (in script)

[zaira]

I try to extend the stage of a sexlab scene like this:
 

SexLabFramework sexlab = SexLabUtil.GetAPI()
sslBaseAnimation animation = sexlab.GetCreatureAnimationByRegistry(animationID)
if !animation
	return -1
endif
sslThreadModel Thread = sexlab.NewThread()
if !Thread
	return -1
endIf
animation.SetStageTimer(3, 9999)
Thread.AddActor(victim,true)
Thread.AddActor(npc1,false)
Thread.AddAnimation(animation)
Thread.CenterOnObject(None)
Thread.DisableBedUse(true)
if Thread.StartThread()
	return Thread.tid
endIf

But the whole scene stops immediately.
The scene has more than 3 stages and I want to extend stage 3 (in principle the whole scene should remain in stage 3 for ever)

The logs
 

[05/01/2025 - 03:14:21PM] SEXLAB - Thread[0]  - Entering Making State
[05/01/2025 - 03:14:21PM] SEXLAB - Notice: ValidateActor(Sklavin Zaira) -- TRUE -- HIT
[05/01/2025 - 03:14:21PM] SEXLAB - ActorAlias[Sklavin Zaira] SetActor([Actor < (00000014)>]) - [sslActorAlias <alias ActorAlias004 on quest SexLabThread00 (1B061EEF)>]
[05/01/2025 - 03:14:21PM] SEXLAB - Notice: ValidateActor(Geiler einfacher Hund) -- TRUE -- HIT
[05/01/2025 - 03:14:21PM] SEXLAB - ActorAlias[Geiler einfacher Hund] SetActor([MEP_AnimalActor < (FF0012C1)>]) - [sslActorAlias <alias ActorAlias003 on quest SexLabThread00 (1B061EEF)>]
[05/01/2025 - 03:14:21PM] SEXLAB - Thread[0] Event Hook - AnimationStarting
[05/01/2025 - 03:14:23PM] SEXLAB - ActorAlias[Sklavin Zaira]  - Waited [1] cycles for MarkerRef[[ObjectReference < (FF000961)>]]
[05/01/2025 - 03:14:23PM] SEXLAB - Thread[0]  - CenterRef == VictimRef: [Actor < (00000014)>]
[05/01/2025 - 03:14:23PM] SEXLAB - Thread[0]  - CreatureRef: [Race <DogRace (000131EE)>]
[05/01/2025 - 03:14:23PM] SEXLAB - Notice: SortCreatures([[Actor < (00000014)>], [MEP_AnimalActor < (FF0012C1)>]], None) -- Return:[[Actor < (00000014)>], [MEP_AnimalActor < (FF0012C1)>]]
[05/01/2025 - 03:14:23PM] SEXLAB - Thread[0]  - FilterAnimations() BEGIN - LeadAnimations=0, PrimaryAnimations=1
[05/01/2025 - 03:14:23PM] SEXLAB - Thread[0]  - FilterAnimations() END - LeadAnimations=0, PrimaryAnimations=1
[05/01/2025 - 03:14:23PM] SEXLAB - Notice: SortCreatures([[Actor < (00000014)>], [MEP_AnimalActor < (FF0012C1)>]], [sslBaseAnimation <alias RegistrySlot151 on quest SexLabQuestRegistry (1B0664FB)>]) -- Return:[[Actor < (00000014)>], [MEP_AnimalActor < (FF0012C1)>]]
[05/01/2025 - 03:14:23PM] SEXLAB - Thread[0] Adjustment Profile - NordRaceF.DogRaceC
[05/01/2025 - 03:14:23PM] SEXLAB - Notice B_Can_B_BlwBJ - PositionOffsets()[Forward:0.000000,Sideward:0.000000,Upward:0.000000,Rotation:0.000000]
[05/01/2025 - 03:14:23PM] SEXLAB - Notice B_Can_B_BlwBJ - PositionOffsets()[Forward:0.000000,Sideward:0.000000,Upward:0.000000,Rotation:0.000000]
[05/01/2025 - 03:14:25PM] SEXLAB - ActorAlias[Geiler einfacher Hund]  - Waited [1] cycles for MarkerRef[[ObjectReference < (FF000B1D)>]]
[05/01/2025 - 03:14:25PM] SEXLAB - PickByRaceKey(Canines)
[05/01/2025 - 03:14:25PM] SEXLAB - ActorAlias[Sklavin Zaira]  - Equipment: [[Form < (298863A8)>]]
[05/01/2025 - 03:14:25PM] SEXLAB - ActorAlias[Geiler einfacher Hund]  - Scales[1.000000/1.000000/1.000000/1.000000/1.000000] Voice[Canines (MNC)] BaseEnjoyment[40]
[05/01/2025 - 03:14:25PM] SEXLAB - ActorAlias[Sklavin Zaira]  - Scales[0.988800/1.030000/0.960000/0.960000/1.000000] Voice[Quiet (Female)] Expression[Pained] BaseEnjoyment[-14]
[05/01/2025 - 03:14:26PM] SEXLAB - Notice B_Can_B_BlwBJ - PositionOffsets()[Forward:0.000000,Sideward:0.000000,Upward:0.000000,Rotation:0.000000]
[05/01/2025 - 03:14:26PM] SEXLAB - Notice B_Can_B_BlwBJ - PositionOffsets()[Forward:0.000000,Sideward:0.000000,Upward:0.000000,Rotation:0.000000]
[05/01/2025 - 03:14:28PM] SEXLAB - Thread[0] Event Hook - AnimationStart
[05/01/2025 - 03:14:28PM] SEXLAB - ActorAlias[Sklavin Zaira]  - Expression.Applied(Pained) Strength:5; OpenMouth:False
[05/01/2025 - 03:14:30PM] SEXLAB - Notice B_Can_B_BlwBJ - PositionOffsets()[Forward:0.000000,Sideward:0.000000,Upward:0.000000,Rotation:0.000000]
[05/01/2025 - 03:14:30PM] SEXLAB - Thread[0] Event Hook - AnimationEnding
[05/01/2025 - 03:14:30PM] SEXLAB - ActorAlias[Geiler einfacher Hund]  - Resetting!
[05/01/2025 - 03:14:30PM] SEXLAB - ActorAlias[Sklavin Zaira]  - Resetting!
[05/01/2025 - 03:14:30PM] SEXLAB - Notice B_Can_B_BlwBJ - PositionOffsets()[Forward:0.000000,Sideward:0.000000,Upward:0.000000,Rotation:0.000000]
[05/01/2025 - 03:14:30PM] SEXLAB - ActorAlias[Geiler einfacher Hund]  - NPC Root [Root] Rotation:[-0.000000, 0.000000, -0.000000] AngleZ:129.706451 Rotate:129.706451
[05/01/2025 - 03:14:30PM] SEXLAB - Notice B_Can_B_BlwBJ - PositionOffsets()[Forward:0.000000,Sideward:0.000000,Upward:0.000000,Rotation:0.000000]
[05/01/2025 - 03:14:30PM] SEXLAB - ActorAlias[Sklavin Zaira]  - MagicEffectsNode Rotation:[-0.000000, 0.000000, 2.493990] AngleZ:129.706451 Rotate:132.200439
[05/01/2025 - 03:14:32PM] SEXLAB - Thread[0] Event Hook - AnimationEnd