e.g: a text file, Pirate.txt, containing {PersistenceRequired:1b} exists in the root of WorldObjects. There is also a bo3 in this directory which contains
Entity(0,1,0,EntityPirate,1,Pirate.txt) Entity(2,1,3,Skeleton,1,Pirate.txt) Entity(1,1,4,EntityPirate,1)
When this bo3 is placed, one EntityPirate without any nbt spawns, as does one Skeleton with nbt. Ideally a second EntityPirate with nbt should spawn.

Thanks,
spork

Thanks for reporting! Will be fixed with v7_DEV_r24, which will be released on the Discord's OTG-dev channel soon.