Change of Visa advice – working visa to tourist visa

So my visa is expiring in a few months, and I’m planning on quitting my job and moving back home.

The issue is, I had heard a lot of people saying it’s a simple process to change from a working visa to a 3-month tourist visa before leaving the country. So I booked my tickets out of Japan about a month after my current visa expires, thinking I had more than enough time.

However, upon further research, it seems like the easy change to the 3-month visa is only if you complete your working contract.

As I’m quitting, and ‘breaking’ my contract, I’ve read that I will only get approved for a 30-day tourist visa.

So, my questions are;

1) Do you know if this information is accurate? Have any of you quit your job and still been given a 3-month tourist visa?

2) Also, if I am approved for a 30-day tourist visa, would my new visa begin immediately (from the date of the immigration office visit), or when my current working visa expires?

Thank you!