FTDNA Includes new T2T experimental SNPS into its Y Philogenetic Tree.
Consequently the S781 extended family is now didived into 4 major lines (S781a, FTT41, FTT48 and A306).
All NGS tests results were checked for verifying the presence of new private SNPs. All philogenetic trees and Y-STR tables are now updated.
What you must take in consideration about new FTT SNPs. FTT SNPs are experimental SNPs discovered by realigning NGS data to the Telomere-to-Telomere (T2T) consortium's complete (but still work-in-progress) assembly of a human Y chromosome from NA24385, an Ashkenazi male belonging to Y-DNA haplogroup J1-M267. Using this assembly allows for discovery of phylogenetically informative SNPs in regions of the Y chromosome where the current official human reference genome (GRCh38) is incomplete or problematic, like parts of the Centromere and DYZ19. These SNPs have been named by Family Tree DNA as they have been considered for experimental inclusion to the Y chromosome haplotree.