The 15 Engine Versions Anniversary coming up soon. 
It’s totally harmless btw, even though it looks really scary and confusing:
BPs-side structs remain the most undercooked core feature imho. Crazy useful, yet volatile and prone to corruption.
Its probably not keeping an internal state on duplication.
The duplicate probably resets some defaults (maybe a newObject / malloc call behind the scenes to keep it separate in memory?)
Would need an extra post init call in code to get it where it should be.
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At this point I’d miss it if it ever got fixed ;p