I was able to find a delay method using Delayer the other day,
I found a bug regarding that.
When the world is loaded, the list created by Delayer cannot be retrieved with the GET function.
It is possible to fix it by moving cards in and out of the variable store.
As a trial, I tested using a list with 1, 10, 100, 1000, 10000, but this one worked normally even if the GET function sandwiched the world load.
[Error message
]Index out of bounds.
Tried to get element 0 of a list of length 0.
Use the getOrDefault operator to provide a default when an index is out of bounds.

Using the getOrDefault operator is the solution indeed.