What verbal reason your boss give?

If I am not mistaken, probation is not stated in our labour law. So legally speaking, "probational staff" should have the right of permanent staff unless it is stated otherwise in the employment contract. Then again, just because it is stated in the employment clause, it does not mean that it is enforceable legally

sorry, you resigned and they said they extended your probation?

Many work are dependent on other stakeholders. It's common everywhere

Yes you still need to be accountable on the result. What the boss wants is for you to be proactive in chasing others up. Basically you are hired to think of solution, rather than stay nonchalant or complaining about it

Basically the extension of probation is for you to demonstrate you can trusted and reliable when being handed those tasks again

Extension of probation only means 2 things: you dont meet expectations or your boss dont like you. Either way, its not good for you. So you must be open to find out where you fail and learn from it.

No one in this world want to lose good employees. So if he/she is good, for sure they will confirm them as permanent employee asap, some even have early confirmation. Just ask yourself, if you have a good employee, wouldnt you do the same too?

How about the exit clause stated in the contract? Do you need to serve any notice once you tendered resignation?