To me it doesn't appear to have unbonded, it looks as if it is 1 continuous threaded piece which is moving along threads inside the hub. When it moves, it moves evenly and smoothly, there's no side to side movement or anything like that
Looks like meant to be like that, you have cut outs on lockring thread to tighten the hub in the flange, tighten that and then try to unscrew the cog. Or use the cutouts to unscrew cog. Lockring tool or similar would be advised.
To me it doesn't appear to have unbonded, it looks as if it is 1 continuous threaded piece which is moving along threads inside the hub. When it moves, it moves evenly and smoothly, there's no side to side movement or anything like that