As
@John *********
already said best is to stay, but as always there is a second best and that is to go somewhere else outside Thailand if you cannot stay any longer in the country you apply, so Manila is an option. There is no abligation to travel direct from the country where you apply to Thailand.
There always is a chance they will ask you for extra information or interview, but as dependent it seems not too difficult. But if it happens you might have a problem.