Should I return or hold onto my Working Holiday Pass?

[woopa]

Hi,

I'm in a bit of a unique situation. I'm currently in Singapore on a Working Holiday Pass (12 months specifically for Australians) that won't expire until roughly mid 2019.

However, I have a new job lined up in Hong Kong so I am making the move over there in January 2019. I'm wondering if I should hold onto the working holiday pass in case of a worst-case scenario where something falls through with the Hong Kong job. I'd regret having given up the WHP if something were to have happened with many months validity still remaining.

Would there be any immigration issues with this, specifically holding a work visa in both Singapore and Hong Kong?