I'm trying to set my population in the R package PopGenome using the function set.populations(). When I check they're set, GENOME.class@populations returns the names but GENOME.class@region.data@populations is empty.

What's the difference between GENOME.class@populations & GENOME.class@region.data@populations?

Here's my code:

#Upload data
GENOME.class <- readVCF("file/path/Ts_chr1.vcf.gz", numcols = 60000, tid = "chrI", 
    frompos = 1, topos = 27000000, gffpath = "file/path/Ts_chr1.gff3")
#set populations
GENOME.class <- set.populations(GENOME.class, new.populations = list(c("TsAK1","TsAK2"), c("TsOR1","TsOR2")))

#Check populations
GENOME.class@populations
GENOME.class@region.data@populations