Based upon the methodology posted here and using the sample set described here, as of January 2019 it appears that there is one Ashkenazi ancestral branch in haplogroup L, without any branching: (1) L-PAGE00116.

L-PAGES00116

January 2019 Analysis - L-PAGES00116

Upstream SNPs:

M20>M22>M317>M349>FGC36845>PAGES00116

ISOGG Haplogroup L Tree (2019-2020): L1b1a

TMRCA (YFull Tree) (as of January 9, 2021)

L-PAGE116: 1,500 ybp (900-2,200 ybp @ 95%)

TMRCA (JewishDNA.net) (as of January 9, 2021)

L-M349 (AB-063): 11-1226 CE (@95%)

Without branching, it is difficult to evaluate the L-PAGES00116 cluster.

Upstream SNPs. L-M20 is upstream from L-PAGES00116, a SNP found in an Ashkenazi Y-DNA cluster.

If men who are reported based upon STR or Geno 2.0 testing as L-M20+ are of Ashkenazi descent on their direct male line, there is a high probability that such men belong to the L-PAGES00116 Ashkenazi Y-DNA cluster. However, a large proportion of the men reported as L-M20+ are not of Ashkenazi descent on their direct male lines.