-When they are healthy they have a tightly closed mouth all the time.
The problem is that most have serious troubles with the trip from the ocean to our tanks. Some combination of being collected roughly, stuck in small bags of water where they regurgitate their waste then reabsorb it into their tissues, the temp and water parameter changes of the different facilities they are held in and exposure to other dying anemones results in most magnificas having something systemically wrong with them. Many succumb to the damage rapidly while some take up to 6 months to die. A few of them recover or don't have the problems for some reason. Not a lot is known about exactly what is going on or exactly why.
The symptoms you are describing sound like a pretty bad sign. In my opinion something happens to the connection between the two layers of tissue in the anemone which causes the deflated mushy look. Not really any science behind that, just from observation.
Some people say you should remove clowns in this situation, but I think with magnificas, the clowns are very beneficial. Just watch out for them being overly aggressive around the open mouth. Also be careful about microbubbles or blowing flow right into the open mouth. You can do a lot of damage very quickly. Also I would move the BTA if you can just to reduce one more possible stress.
Best of luck with him and let us know how it goes.
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~Cindy~
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