§ 721 Preceding section qualified

This rule puts a limit on the protection given by the section before it. Normally, once someone receives money or property as an heir or beneficiary and the estate is properly closed out, they don't have to worry about giving it back later. But this rule says that protection does not apply in certain special situations.

If it turns out the "dead" person is actually alive, or a will is found after the court already handled the estate as if there was no will, or an earlier will gets thrown out after someone already received property under it, the rules change. In these cases, the person who received the money or property can still be required to give it back to whoever actually has the legal right to it.

In short, this rule protects the real heir or beneficiary when a major mistake is discovered, even after property has already been handed out. Someone who received property based on wrong information doesn't get to keep it just because the estate was already settled. They may still have to return it to the rightful owner once the truth comes out.