Lichen Bark
kiwifarms.net
The only way I can experience something like this is during a dream. In a dream you might be many different things, or even some kind of creature, but one thing that I always experience is the feeling of accepting my current situation. There is a certain amount of basic infomation about the setting I just know, and I just snap into acceptance and start doing whatever it is I am supposed to be doing in the dream. Like if I was an italian pizza maker, in the dream I would feel like I have always been this italian pizza maker.But in any case loss of this localized self does not mean what you fundamentally are loses consciousness. Your localization does of course. But you were only a thought, and many more localizations will appear.
It's rather bizzare, but in the dream I don't miss being lichen bark, I am the pizza maker. I'm not sure how I feel about not missing my other "self."