Looks like when you unscrewed it, the expander unscrewed rather than the cap. So half of your expander is probably somewhere at the bottom of your fork steerer.
Definitely this.
Flip the bike upside down and the bottom part should just drop out if it is not wedged on the fork crown.
It's a delicate setup, you dont wanna overtighten it as carbon cracks, got access to a torque wrench? If not, time to source one.
The bottom part won't come out as the locking ring is stuck onto the steerer. Yeah I have a torque wrench and used it :/
Edit: Got it out, will change the type of plug, i hate this one
@coventry_eagle started
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Looks like when you unscrewed it, the expander unscrewed rather than the cap. So half of your expander is probably somewhere at the bottom of your fork steerer.