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Is it this lock?
https://www.fullex-locks.com/fullex-fire-door-slam-shut-autolock/If so, it's effectively lifting the handle every time the door closes and automatically throwing the top and bottom bolts.
Turning the key/cylinder throws the central Deadbolt and blocks the operation of the handles, like a common lift lever multipoint lock
user69121
Well I have had a new fireproof door and frame fitted, there seem to be the most pointless locking points. The catches come out when the door is closed, and open on opening that handle. There is no lift the handle to double or dead lock.
Will photograph and see what you guy think.