The Dialogs Are Auto-Dismissed Running Sample Scripts In Script Editor

AppleScript Dialog Toolkit
#1

macOS Mojave
AppleScript 2.7
ScriptEditor 2.11
Dialog Toolkit Plus 1.1.2

I run the script, the dialog flashes before disappearing. I have to run repeatedly until it’s stuck. It’s the same in every sample script. Why is it so?

#2

What happens if you use Script Debugger?

#3

It ran as expected but in ScriptEditor the button giving up would go off arbitrarily and before long when the time allotted for the action to fire up hasn’t elapsed: now the dialog stays put, then it doesn’t.