Title:
afterSelectionChanged triggers "The object no longer exists" error even when a valid object is selected

Description:
When using the method addEventListener("afterSelectionChanged", ...) in an ExtendScript script for InDesign, the application consistently throws the following error:

"The requested action could not be completed because the object no longer exists."

This occurs even when:
- A single TextFrame is manually selected,
- The object is valid (isValid === true),
- The code is wrapped in a try/catch,
- An idleTask is used to defer execution.

Steps to Reproduce:
1. Open an InDesign document.
2. Add the following script:

function onSelectionChanged(event) {
try {
if (app.selection.length > 0 && app.selection[0].isValid) {
alert("Selected: " + app.selection[0].constructor.name);
}
} catch (e) {
alert("Error: " + e.message);
}
}

app.addEventListener("afterSelectionChanged", onSelectionChanged);

1. Select a TextFrame on the page.

Expected Result:
The script should display the type of the selected object without error.

Actual Result:
An error message appears immediately:
"The requested action could not be completed because the object no longer exists."

System Information:
- InDesign Version: 20.4.1
- OS: macOS 15.3.2
- Language: French
- Script executed from: Scripts Panel

Comment:
This behavior prevents reliable use of afterSelectionChanged for interacting with the selection. It appears that the event is triggered before the selection is fully stabilized, making app.selection[0] unusable.