Anyone experiences that your potential new employer asking "May We Contact Your Current / Previous Employer?"?
Instead the HR insisted to reach superiors / bosses / top management who may provide more detailed info than my colleagues aka friends/buddies.

as my case, the head of department offered a position to me as confirmed for employment yesterday and any HR related issues can deal with him only.
Out of sudden, someone titled "HR & Admin" requesting for more details and expecting for the of contacts current / previous employers.

after some thoughts, I decided open book instead as thinking transparency to new employer, list down all my previous and current bosses no matter had conflicts before or not and highlight the reasons for previous resignation, eg: staff welfare, poor sales performance, different thoughts/mindset, etc.

However regret that I hostile purposely to current boss for the past few months as I planned to propose for early release during tender resignation for allowing me to join the new company soonest. Unsure what my current boss will feedback to the HR today.

Then it defeats all purpose of the employers asking that question isn't it? If that is the case, they can just say something along the lines of "We may or may not contact your ex employers for work reference or background checks". That question is redundant to say the least.
Like another user here has already mentioned - your issue for lashing out at your superiors. No matter how much you do not like or disagree with your superiors, you do not lash out at them. If you disagree, best you can do is to discuss with them a better way out for you. Like you mentioned, your company is cutting cost and what not. If you have interacted with them nicely, they may have agreed to let you go at an earlier time.

One of my previous employers was like that. They let me off earlier than the required serving months and I don't have to pay for the extra month's salary in lieu of. Next employer, try not to do this again.
Fair point. I have to agree with the "putting in good words for you" part though. Sometimes they may even go the extra mile for you if you were nice to them. Just sad that there weren't a lot of those kinds of employers...