I would think the seller is contractually bound to honour the first assigned agreement. Have your lawyer tell them you are not tire kicking. Just want to engage the original agreements terms as is normal and contractually agreed to. You might have to threaten to sue to get them enacted. Or I am missing something.

What I am not missing right now is due diligence by the buyer will have to be really done well. If you still want the property. In a way the locking you and/or the inspector out on an agreed contractural inspection day may already. be a breech of contract by the seller.

There may be a disaster with the property as the seller wants you to agree basically the house is as is other than it has been cleaned. Anything negative found could not be applied then.

In simple terms the new agreement is a potential downhill ride. What is with your realtor? You need a lawyer familiar with your venue now to move forward. It almost seems like an attempt to tie up or seize your deposit as well. Do not sign anything further now without a lawyer looking it all over. This smells in too many ways. .