question

I am afraid you are using the combiner kind of "wrong". It is supposed to have at least two input connections. It will then take one item through the first port and a predefined number of items through the rest before it starts its processing time. See the manual for more information:
https://docs.flexsim.com/en/21.1/Reference/3DObjects/FixedResources/Combiner/

In your model it does not have any connections going in, so what happens is the following:
As soon as an item is placed into the combiner the process time starts, because the number of components it waits to collect defaults to zero. When the process time elapses, all items currently in the combiner are merged into one, because it is set to "join".

Furthermore, apparently the getProperty command currently does not function correctly, when the property in question is not a strict value but defined through code, such as the "Different for Nth Item" option. This results in the delay of the process flow always being zero seconds. To get the correct value (only if the item is already in the combiner) you can use the following for now.

 Model.find("Combiner1>variables/cycletime").as(treenode).evaluate();

What happens in your model is:
When the first item enters the combiner, the process time starts. The operator finishes packing the pallets into the combiner before that time has elapsed and the stack of pallets is moved into the queue by the process flow. The first green pallet was not yet merged into the first red one and remains in the combiner.
When the process time has elapsed, a new red pallet was already loaded into the combiner and is now merged into the old green one, thus destroying the red pallet. Some time later, the process flow tries to move the red pallet, but can't because it doesn't exist anymore and the token gets stuck.

I adjusted your model by doing the following:

- Adding two queues (Queue4 and Queue5) that lead into the combiner. The first red pallet is unloaded into Queue4 that connects to the first input port of the combiner, the first green pallet is put into Queue5. This way, the process time of the combiner only starts when the green pallet has been unloaded.

- Replacing the delay in the process flow with a "Wait for Event" activity that listens to the "OnProcessFinish" event of the combiner. The token is only send to this activity if the combiner is still processing when all pallets have been loaded (Check for state "Processing" in the "Decide" activity)
A zero-time delay "Breathe" after the Wait for Event makes sure the process has been properly finished before the pallets are moved into the queue.

- Also fixed another error message: In one of the columns of the statistics collector, the "Add Value" field contained the actual text "None" instead of the placeholder "None". (Which, I agree, is confusing and counterintuitive)

hundegger-0_1.fsm