P: Need a way to recover in Camera raw

Work lost. I was doing a complicated set of masks in PhotoShop Camera Raw (14.3) and was getting very happy with the results. I would say the image had about 15-20 minor tweaks to the mask and I had spent an hour or so getting it to that point. 

Then I must have hit a key or done something similar as the entire image returned to its base state with the exception of a simple subject mask (even the mask name reset). 

That is when I started to look for a undo or history to reverse the "whatever" I had done. I had not made any snapshots or saved any settings at this point. After chatting with a tech it became clear I was out of luck and would just have to start over.

It never occurred to me there would not be a history of the ability to do a series of undos (this is all within the Camera Raw module). 

The tech suggested to me that I post this experience and put it on the wish list. 

So here it is,

A way to recover from an error in the PS Camera Raw module - I think this has become important as we (the user) are spending more time in it and now have a bigger stake in the work done in it.

I know (now) there is the ability to do snapshots, but that is an active measure you have to perform. Even if the module created snapshots automatically and discarded them when you closed the module would be a help.