Not sure what you're expecting, but...
I can say my house is valued as $1,000,000 when I write my will, but if it's really only worth $350,000 when I die, then that is the value of it when it goes into my estate for distribution. What I said it was worth (whether due to an insane real estate bubble, boastful bragging or just wishful thinking) when I wrote the will is irrelevent.
Likewise, if you thought you were going to get Uncle Joe's $1,000,000 stock portfolio, you may feel slighted when you end up with only $500,000 in stock after the market crashed but if you received the stock portfolio you were willed, then you got all you're going to get.