While assembling the 555 timer based circuit below I noticed that 1) the intended delay on pin 3 only works if the switch on pin 2 is closed before attaching the circuit to the 9V power supply.
2) If the power supply is already attached and pin 2 is opened, closing it will produce the desired turn on delay on pin 3, which is fine.
My first question is whether scenario #1 is indeed the expected behavior in monostable mode (or perhaps a flawed construction on my part). The second question is whether it is possible to provide a delay also in the case where pin 2 remained closed but the power supply would be removed and reattached later on.
PS: I have looked into a similar question but was not convinced it can help in this case.